商741火成岩区构造应力场模拟及裂缝预测  

Tectonic stress field simulation and fracture prediction in Shang 741 igneous rock area

作　　者：杨少春[1] 郭智[1] 刘金华[2] 陈庆春[3] 张晓磊[1] 陈国宁[1] 

机构地区：[1]中国石油大学(华东)地球资源与信息学院,山东青岛266555 [2]江苏油田分公司博士后流动站,江苏扬州225261 [3]胜利油田分公司临盘采油厂,山东德州251507

出　　处：《断块油气田》2011年第3期277-280,共4页Fault-Block Oil & Gas Field

基　　金：国家科技重大专项"复杂油气藏精细表征及剩余油分布预测"(2009ZX05009-003);中国石油大学(华东)研究生创新基金项目"永8地区沙二段复杂断裂系统对剩余油分布的影响和控制作用"(SZ10-03)

摘　　要：构造应力场是岩石变形和断裂的直接作用因素。传统的构造应力场模拟研究,是依据少数几个井点的岩石力学试验数据,将地层粗略地看作岩石力学参数处处相同的、均一的地质体,得出的结果往往与地下地质情况相距甚远,在实际应用中的效果较差。以惠民凹陷商741火成岩区××层段为例,根据常规测井资料识别火成岩岩性并求取其岩石力学参数,采用一种新方法,即针对不同性质地层赋予不同弹性模量和泊松比,实现可变岩石力学参数下的构造应力场模拟。以此为依据,综合露头、地层倾角测井等资料进行了裂缝预测,将研究区划分为3个裂缝发育有利区。应力场模拟结果表明,研究区大致可以分为东西两片压应力区,与前人研究结果及实际情况大致相符,应用效果较好。应用结果说明利用有限元数值模拟技术,分岩性赋予地层不同的岩石力学参数是一种研究构造应力场的可行方法,为裂缝性储层的定量预测提供了一种有效的途径。Tectonic stress field is the direct factor of rock deformation and fracture.The previous study of tectonic stress field simulation based on a few well points of data from rock mechanics experimentation regarded the formation roughly as a homogeneous geological body with the same mechanical parameters anywhere,which would inevitably result in the distortion of simulation results and be supposed to have minor practical effect.A certain layer of Shang 741 igneous rock area in Huimin Sag was taken as an example based on the acquirement of rock mechanics parameters and the identification of igneous rock lithology by conventional logging data and a new method was adopted,which gave different elastic modulus and Poisson′s ratio to rock strata with different lithology characteristics.The tectonic stress field was simulated with the variable parameters of rock mechanics and fracture prediction was done combined with several kinds of data,such as outcrop and dip log,in which the study area was divided into three favorable fracture areas.The fact that the simulation results are consistent with previous knowledge shows that the finite element numerical simulation technology considering different lithology and rock mechanics parameters is a feasible method of studying the tectonic stress field,providing an effective way for the fracture quantitative prediction.

关 键 词：火成岩 构造应力场 岩石力学参数 裂缝预测 商741区 

分 类 号：TE121.15[石油与天然气工程—油气勘探]