致密碎屑岩储层构造裂缝微构造曲率预测方法  

PREDICTING METHOD OF THE MICROSTRUCTRAL CURVATURES OF THE TECTOCLASES/STRUCTRAL FRACTURES IN TIGHT CLASTIC RESERVOIRS

作　　者：刘金华[1,2] 唐建东[3] 钟思瑛[1] 程平[1] 葛政俊[1] 

机构地区：[1]江苏油田地质科学研究院,江苏扬州225012 [2]江苏油田博士后流动站,江苏扬州225012 [3]江苏油田开发处,江苏扬州225012

出　　处：《大庆石油地质与开发》2011年第6期13-17,共5页Petroleum Geology & Oilfield Development in Daqing

基　　金：中国石油天然气股份有限公司科技风险创新基金项目“油气储层裂缝及其有效性预测技术”（060511-1-8）资助.

摘　　要：在江苏油田庄2断块碎屑岩油气储层构造裂缝分类研究基础上，利用储层构造裂缝主要分布在断层附近和地层曲率较大区域的规律，提出了利用微构造曲率分布特征对储层构造裂缝分布进行预测研究的新方法。具体方法为：将研究层位顶面局部近似为一个球面，可通过计算此面内球体的半径，进而利用公式求取该局部微构造顶面的平均曲率，从而利用曲率大小对裂缝的发育程度进行预测。各类沉积微相在沉积过程中沉积物顶面也存在一定的曲率，因而传统的利用储层顶面曲率来预测裂缝的方法存在一定的误差，为此提出利用各类沉积微相沉积期相对水平的层面进行微构造研究的新思路，并以庄2断块水下分流河道微相为例，对研究区水下分流河道的微裂缝发育进行了预测。On the basis of the differential researches about Zhang No. 2 Fault Block of Jiangsu Oilfield, with the help the tectoclases of the clastic hydrocarbon reservoirs in of the rules of the reservoir fractures main distribution nearby both the faults and the region with large formation curvatures, the new predicting method is presented to forecast the structural fractures of the reservoirs by means of the characteristics of the curvature distribution of the microstructures. The specific method is that the top face of the studied strata is regarded as the surface of a sphere, the average curvature of the partial microstructural top face can be obtained by the radius ＂R＂ of the sphere in the surface, so the developed degree of the fractures can be predicted with the help of the values of the curvatures. During the process of deposition, there exist a certain curvatures in the top surfaces of deposits in different kinds of sedimentary microfacies. Thus the corresponding errors result from the predicting method of the fractures by the tra- ditional top surfaceg curvatures of the reservoirs. Therefore a new thought is put forward to study the microstructures by means of the relatively horizontal surfaces in the sedimentary period of various microfacies. At the meanwhile, taking the underwater distributary channel microfacies in Zhuang No. 2 Fault Block as example, the development of the micro-fractures of the channels in the study area can be predicted.

关 键 词：油气储层 构造裂缝 微型构造 曲率 裂缝预测 

分 类 号：TE122.2[石油与天然气工程—油气勘探]