英旺探区延长组特低渗储层测井评价

1、英旺探区延长组特低渗储层测井评价        【中文摘要】英旺油田延长组油层勘探开发历程近30年,只在最近几年勘探开发取得突破性进展,目前探明观亭、庙湾两个富油区域,控制含油面积约40km2,控制地质储量约1600万吨,已钻井近400口,年产油1.3万吨,取得了明显的社会及经济效益。由于油田生产任务紧、技术职员少,石油地质基础研究相对薄弱,基本未进行过系统油层划分、储层测试及分析,对砂体展布特征、沉积相分布特征、储层特征、油气富集规律、四性关系等方面的石油地质综合研究尚浅,严重制约着本区今后的勘探部署及有效开发。

2、本文通过对研究区现有的钻井、测井、岩心、分析化验资料的研究,再选取了一些有代表性的探井采样进行了分析和测试,并用专业软件对数据进行了处理和分析,取得的主要熟悉有:1.把握了研究区特低渗储层岩石的颜色、成分和结构等岩石学特征。2.对各种测井资料通过实验室测试进行整理分析,以尽可能正确地得到储层各参数及其之前的相互关系,为利用测井资料正确计算各测井参数提供依据。3.对研究区不同仪器系列、不同井之间的重点测井曲线进行了标准化处理和校正之后研制了孔隙度、渗透率解释图版和含水饱和度解释模型。4.将本区有效厚度的岩性下限标正确定为细砂质粉砂岩;确定本区含油级别下限为油迹级;确定本区物性下限:长2+3油层下

3、限:孔隙度为10%,渗透率为0.2×10-3m2,长6-长8油层下限:孔隙度为8%,渗透率为0.15×10-3m2。5.主要依据自然电位或自然伽玛曲线的半幅值点和微电极曲线,结合电阻率测井曲线综合确定了有效油层顶底界面;并依据研究区测井曲线的纵向分辨能力和解释精度及压裂工艺的实际情况,对有效厚度的起算和夹层的起扣厚度作出了规定。6.确定了研究区含油面积、有效厚度、有效孔隙度、原始含油饱和度、地面原油密度、地层原油体积系数和原始气油比等储量参数,采用容积法计算得英旺油区猜测储量结果为:长2+3油层石油猜测储量4521.9076×104t;长82油层石油猜测储量151

4、3.7697×104t,长83油层石油猜测储量3003.4487×104t,合计石油猜测储量9039.1261×104t。并对可采储量进行了猜测。7.对研究区延长组储层进行了分类和评价,并对储层的敏感性作出了评价。');【Abstract】 The exploratory development of Yan chang oil formation Ying Wang oilfield has already been went on around 30 years. But it just obtains unprecedented progress a

5、t recently several years. At present in Guan ting and Miao wan these two rich oil areas it has been proven up that there are about 40km2 oil-bearing areas and 16,000,000 ton original oil in place were controlled. There are about 400 drilled wells and about 13,000 ton yearly production forecast. It h

6、as obtained the remarkable society and economic efficiency. Because the oil field production task tight, the technical personnel are few, petroleum geology basic research relatively weak, the systemic oil layer division and the test and analyze of reservoir has never been carried in essence; the syn

7、thetic study of petroleum geology in the sand through-going characteristic, sedimentary facies distributed characteristic, reservoir characteristic, concentration rule of oil and gas, the correlativity of four characters still is shallow. It will seriously be restricting the home court next explorat

8、ion deployment and the effective development.In the article, using the analysis about the material of drilling, oil well logging, core sample, analysis chemical examination material, then we selected some representative sampling of prospecting well to carry on the analysis and the test, processing a

9、nd the analysis with the professional software to the data, obtained the main understanding included:1. Grasped the especially low permeable reservoir petrology characteristics: the rock color, ingredient and structure of the research area.2. Through the reorganization analysis of each kind of log i

10、nformation from the laboratory test, obtains the reservoir various parameters and the before reciprocity as far as possible by accurately, for calculates various oil well logging parameter using the log information to provide the basis correctly.3. After carried on the standardization processed and

11、adjusted the key bore logs of the different instrument series and the different wells of the research area, we have developed the porosity, the penetration coefficient explanation chart version and the water saturation explanation model.4. In this research area, the standard of the effective thickne

12、ss lothological lower limit of this research area has been ascertained that it was the thin sandy siltstone; the rank of oil has been ascertained that it was oil trace level; the lower limit of Chang 2+3 oil layer: the porosity is 10%, the penetration coefficient is 0.2×10-3m2, the lower limit

13、of Chang 6- Chang 8 oil layer: the porosity is 8%, the penetration coefficient is 0.15×10-3m2.5. The effective oil layer goes against bottom boundary has been ascertained by natural potential or the nature gamma curve half peak-to-peak value and the micro electrode curve and electrical resistiv

14、ity logging curve synthetically. And rests on the research area bore log longitudinal resolution and the explanation precision and the compression fracture craft actual situation, buckled thickness to effective thickness beginning reckoning with the band to make the stipulation.6. The oiliness area,

15、 the effective thickness, the effective porosity, the primitive oil saturation, the ground crude oil density, in place oil reserves parameters and so on volume coefficient and primitive gas-to-oil ratio was ascertained; used the volumetric method to calculate Yingwang oil region forecast reserves result: petroleum forecast reserves of Chang 2+3 oil layer is 4521.9076×104t, petroleum forecast reserves of Chang 82 oil layer is 1513.7697×104t, petroleum forecast reserves of Chang 83 oil layer is 3003.4487×104t, sum total petroleum forecast reserve