大庆探区外围中、新生代断陷盆地群油气地质条件及远景评价

1、大庆探区外围中、新生代断陷盆地群油气地质条件及远景评价本文是在全国油气资源战略选区调查与评价项目大庆探区外围中、新生代断陷盆地油气地质条件综合评价(XQ-2004-07-06)课题支撑下完成的。以石油地质为主线,强调基础地质条件对油气形成和聚集的控制作用,综合前中生代基底构造及演化、中-新生代盆地构造、古地理格局、烃源岩特征等方面的研究成果分析的基础上,运用多手段、多方面资料和成果信息,将大庆探区外围盆地划分为东、中、西3个含油气盆地群、6个勘探层系、7个盆地系统、5种盆地类比类型、5个成盆构造演化阶段。这一时空框架控制了研究区油气发育的基本格局。在这一时空格架下,应用数学统计方法,通过基础地

2、质框架下油气远景评价、盆地模拟评价、多参数油气地质评价,对外围盆地进行优选排序,优选出汤原、方正、大杨树、三江、延吉、孙吴-嘉荫、漠河6个盆地作为一类远景盆地,并通过神经网络确定各参数层的权重基础上,对勘探程度较高汤原、方正、三江(西)、延吉盆地,在油气地质与评价系统(PrtroGIAS)下,应用多源信息叠合进行了有利区带预测;对勘探程度较低的大杨树、孙吴-嘉荫、漠河三个盆地,通过最新MT资料、重磁反演、地震解释结果及油气地质条件的分析,并进行油气远景评价,提出主要勘探区与战略远景区。这无疑对大庆探区外围主要盆地油气勘探目标的优选创造了新的条件,对加深盆地的形成演化规律和油气勘探的研究都具有非

3、常重要的意义This thesis is completed under the support of the investigation and appraisal project of the national oil and gas resources strategy electoral district-the comprehensive evaluationof oil and gas geological quality of the Cainozoic Era breaks falls basin in the periphery of Daqing prospecting r

4、egion (XQ-2004-07-06). The research area is the periphery basin group of Daqing prospecting region, which is distributed within the boundaries of Heilongjiang Province, Hulunbeier City of InnerMongolia Autonomous Region and Jilin Province. Besides Songliao basin, and Hairlar basin, there are 28 sedi

5、mentary basins with an area of more than 200km2, and the total area of the basin group amounts to 18.53104 km2. These basins are close to an important oil and gas production area-Songliao basin in our country, but the proving rate of these basins is relatively low, which demonstrates that they still

6、 have much exploration potentiality. The exploration achievement obtained unceasingly in recent years, has continuously increased the oil reserves of our country, all of which has indicated the urgency and importance of further development of oil-gas exploration in periphery basin of Daqing prospect

7、ing region.The oil-gas prospect appraisal is an important link in the oil-gas exploration process which involves many geological data and the assessment methods. Through comprehensive analysis of the multiple source geoscience information, the oil-gas prospect appraisal makes an overall assessment o

8、f oil-gas resources potentiality in a certain area, and then optimize the advantageous area belt. The oil-gas prospect appraisal is a kind of system engineering, which provides policy-making support for further exploration and development and plays an influential role in the oil-gas exploration and

9、development.Along with the further development of the oil-gas exploration work, massive multiple source geoscience information has been obtained, such as geology, geophysics, geochemistry, remote sensing material and so on. However, it is not only time-consuming and hard sledding to withdraw the use

10、ful information from these numerous material to carry on this work, but also needs lots of investment. Moreover, the anticipated effect is difficult to be achieved, and also, the method and technology cannot be promoted well. Along with the rapid development of computer technology, it has been widel

11、y used in the scientific research of various trades and occupations, A broad prospect for carrying on the oil-gas resource appraisal has been developed by using the computer technology to process the massive geoscience material fast and effectively .GIS has the formidable spatial analysis function t

12、o geoscience data, can obtain the concealed important conclusion from the known geoscience data and derives new information, meanwhile , as a model of the real world, it will make a generalized analysis of the appraisal results and function of the real worlds each side thought. Therefore , using GIS

13、 is an important way to make full use of known data and extract latent information as well as raises the oil-gas forecasting level. To carry on the oil-gas resource appraisal , massive petroleum geology factors must be taken into consider ,which include lots of conditions, the amount of resources an

14、d the economic evaluation, such as foundation stratum research ,source bed, reservoir bed , cap bed and their combination relations of target zone, trap,oil-gas migration and the preservation and so on. All these factors are related to certain geography space position, have spatial information chara

15、cteristic. Based on the analysis and research of the petroleum geology theory, the petroleum geologists express the above various factors by the way of graphic mode, and finally achieve the generalized evaluation goal of the oil-gas resources through the overall analysis of all kinds of graphic docu

16、ment.From the history of study and current situation, the periphery basin exploration and the research degree are low. In the central and western basin group, the study of petroleum geology is relatively weak, mostly giving priority to non-earthquake information on the Earths materials that mainly f

17、ocus on large-scale gravity and magnetic exploration, magnetotelluric sounding over the oil field investigation and geological survey; Although the eastern part of the basin group has been the exploration focus of the external Songliao Basin, the basin is many and small, highly divided, post-structu

18、ral role in the transformation and strong destruction, which exploration and research is difficult, so the overall extent of the exploration area are lower, moreover various basins research degree phase difference is disparate. On this basis, our predecessors in the periphery of the basin, carried o

19、ut on a lot of research work, but in the main basin, such as the structural layer, phase of tectonic evolution, basin type, thermal history and the basin hydrocarbon compound maturity history, the advantageous area belt forecast and so on that the question research still has certain difference, and

20、is restricting the periphery basin oil gas prospect appraisal.The periphery basin of Daqing prospecting region is mostly the transformation- superposition basin. The overall exploration degree is relatively low, which is characterized by the multi-cover hydrocarbon source rock, many kinds combinatio

21、n of reservoir bed and cap bed, the multi crude and platoon hydrocarbon and multi-stage petroleum reservoir characteristics and so on. It is extrapolated that there exist sources of many kinds of oil-gases. Usually exploration goal level burying depth to be big, experience long-term evolution, the o

22、il gas pool charge history is complex and the oil-gas distribution rule has been restricted by many kinds of factors. The complexity of oil-gass formation and accumulation in the superposition basin has determined that the oil-gas prospect appraisal could not be carried on with conventional and simp

23、le norm or rule.Therefore, this article when carries on the oil gas prospect appraisal to the research area, take the petroleum geology as the master line, emphasizing the basis of geological conditions on the formation and accumulation of control oil and gas, integrated research results based the a

24、nalysis on pre-Mesozoic basement structure and evolution, the Mesozoic-Cainozoic Era basin structure, the ancient geography pattern, hydrocarbon source rock characteristic and so on. Utilizing the multi-methods, various material and achievement information, Daqing Exploration Area is divided into th

25、ree basin groups of eastern, central and western, six-storey department exploration , seven Basin system, six exploration formation ,four kinds of basin types, three kinds of superimposition relationship ,and experiences five stages of basin tectonic evolution. This space and time frame has controll

26、ed growth oil and gas basic pattern in the research area.Under this space and time frame, Using the geological analogy method, from three levels geological feature of the region, the basin, the internal of basin, carries on research on control migration and accumulation basic geologic factors resear

27、ch such as regional geology background, geostructure evolvement, basin structure and evolvement, deposition and backfill history and volcanic activity .Moreover, find out the relationship between with oil and gas and composition and structure of oil and gas basin fundus, volcanic rocks and the role

28、of volcanic, basin tectonic, basin filling sequence, basin evolution, regional fault. Finally, carry through sorting preferred Basin from basic geological framework. Using basin modeling techniques, carry on sorting preferred Basin by simulation results of terra history, thermal history, mature hist

29、ory. Under multi parameter conditions, Making full use of computer technology, carry on sorting preferred basin by condition such as basic geological factors, and source bed, reservoir bed, cap bed, combination relationship. Establishing evaluation model of oil and gas basing on neural network to de

30、termine parameters weight, The thesis carries on predicting favorable play for basins of higher exploration levels such as Tangyuan Fangzheng and west of Sanjiang and Yanji basin by multi-source information superimposed method basing on PrtroGIAS. For basins of lower exploration levels such as Dayan

31、gshu and Sunwu-Jiayin and Mohe basins, The authors carries on forecasts for oil and gas and proposes the main exploration area and the strategic prospect area by up-to-date information of MT, gravity and magnetic inversion and seismic interpretation. The final results obtained the understanding of t

32、he following:P utting forward five evolution stages experienced, development 4 kinds of basin types and 3 kinds of superimposition relations in Basins of study areaOn the basis of deeply researching about earth structure evolvement in the study area and the adjacent areas, This thesis proposed the r

33、esearch area had experienced five major stages of basin structure evolution, namely Late Triassic - Early Jurassic and Middle Jurassic and Late Jurassic-Early Cretaceous and Late Cretaceous and Paleogene. Different times the intensity and way of tectonic movement are some differences in eastern, cen

34、tral and western of study area; The eastern area take place thrusting nappe structure, while the Cainozoic Era has superimposed along the region branch break growth linear rift valley basin as a characteristic; The features of central region ware that development with a complete rift and depression

35、in two stages of the rift basin ;According to different spatial relationship during Basin formation, the western area take foreland basin(compressional basins) in early -middle Jurassic period and volcano down-fault basin in early chalk volcano period as characteristic. The west main growth foreland

36、 down-fault -type of superposition basin as characteristic ,while the central area main take down-fault depression -type of superposition basin and the eastern area take rift valley down-fault compression draw dispart-type of superposition basin as characteristic. These three kinds of superimpositio

37、n relations reflected obvious difference from evolve history in western,eastern and central areas of three basin groups of the research area in Mesozoic-Cainozoic Era.T ime and space pattern of oil-gas growth of Mesozoic-Cainozoic Era basin determined in the periphery of Daqing prospecting regionIn

38、the horizontal by comprehensive study on structure subarea, basin-fill sequences and basin tectonic evolution, The research area may divide into the eastern part, middle, the western part of oil and gas bearing basin group by the boundary of Jiayin-Mudanjiang hybrid rocks belt and Nenjiang River-Bal

39、ihan stretch-track-slip tectonic zone. And Dayangshu basin ,which belong to the western basin generally, through analysis of causes of formation between with Dayangshu basin and Songliao Basin, Dayangshu basin came into being down-faulted basins system along western margin of Nenjiang - Kailu breaks

40、, so it is believed that belong to central basin group.According to basins structure characteristic, deposition backfill sequence and evolved history for 14 basins in the research area and various basins in adjacent areas, The thesis classified as seven basin system (or basin system)for 14 basins, w

41、hich,basin system has been access to oil and gas breakthrough, so Sunwu-Jiayin basin, Dayangshu basin, Gehe-Labudalin basin and Tangyuan- Fangzheng down-faulted basins are speculated to have the big oil gas prospect by contrasting with regional basic geological conditionsIn the vertical, by contrast

42、ing stratum with Songliao basin and Hailar Basin, the exploration layers are divided into six exploration strata series (including Carboniferous - Permian), in which, The first, the second and the third layer are worth paying attention to important exploration strata series; The fourth - the sixth e

43、xploration strata series have obtained the industry oil and gas current in Daqing and Daqing periphery; The fourth and the fifth exploration strata series oil and gas contribution strata in middle bearing oil and gas basin group ;The fourth exploration strata series is oil and gas contribution strat

44、a in west bearing oil and gas basin group ;The sixth exploration strata series is oil and gas contribution strata in eastern bearing oil and gas basin group.This space and time frame has controlled growth oil and gas basic pattern in the research area.Establishing the geology analogous model of the

45、prospect appraisal of oil-gas basinAccording to the structure and composition of basin basement, basin types, evolution basin evolution and comprehensive study about oil-gas geological condition, the research area mainly includes 5 types of oil-gas prospect geology analogy evaluation models, which a

46、re the remaining basin and down-fault depression of double-decked basin and down-fault and compression and pull-apart basin. Eastern oil-gas basin groups mainly include the remaining basin and pull-apart basin, while the middle oil-gas basin group mainly bears the down-fault depression basin, and th

47、e western area mainly bears down-fault and compression basin. These basins can be regarded as a scale, and make a comparison with these 5 types of typical basins in the research area in order to forecast the oil-gas prospect.Using variety of methods to carrying on sorting preferred basin in Daqing p

48、eriphery basinsUsing the geological analogy method, from three levels geological feature of the region, the basin, the internal of basin, carries on research on control basic geologic factors of formation and migration and accumulation such as regional geology background and geostructure evolvement

49、and basin structure and evolvement and deposition and backfill history and volcanic activity .Moreover, finding out the relationship between with oil and gas and composition and structure of oil and gas basin fundus and volcanic rocks and the role of volcanic and basin tectonic and basin filling seq

50、uence and basin evolution and regional fault. Finally ,carrying through sorting preferred basin from basic geological framework. Using basin modeling techniques, carrying on sorting preferred basin by simulation results of terra history and thermal history and mature history. Under multi parameter c

51、onditions, Making full use of computer technology, carry on sorting preferred basin by condition such as basic geological factors and source bed and reservoir bed and cap bed and combination relationship. The authors establish appraise model and make use of multiplication law to preferred sort and q

52、ueue. Finally, the authors sort and queue 6 key basins such as Tangyuan - Fangzgeng, dayangshu, Sanjiang, Yanji, Sunwu - Jiayin,Mohe basins by synthetizing three methodsCompleted oil and gas prospect evaluation for keystone basin and favorable play evaluation for major exploration layer in keystone

53、basinFor Tangyuan - Fangzheng, West of Sanjiang basin and Yanji basin which have more of the wells, higher exploration levels, rich oil gas material Through a number of known oil and gas characteristics attribute value of favorable play for network learning training by using artificial neural network, then determined parameters weight and established evaluation model of oil and gas, The thesis carries on predicting favorable play basing on PrtroGIAS by multi-source infor