构造裂缝发育区带预测的有效方法——以北大港构造带东翼东营组为例  

Available Approach to Structural Fracture Estimating——A Case Study of Dongying Formation in Eastern Limb of North Dagang Structural Zone

作　　者：张守仁[1,2] 张遂安[1] 万贵龙[3] 

机构地区：[1]中国石油大学(北京)气体能源开发与利用教育部工程研究中心和石油工程教育部重点实验室,北京102249 [2]中联煤层气有限责任公司,北京100011 [3]中国地质大学(北京)地球科学与资源学院,北京100083

出　　处：《中国石油勘探》2012年第2期38-43,61,共7页China Petroleum Exploration

基　　金：国家科技支撑计划课题"低(超低)渗透油田储层保护与油藏整体压裂改造技术研究"(2007BAB17B0003)

摘　　要：随着能源危机的日益加重和油气资源勘探开发进程的不断深入,裂缝型油气藏勘探技术快速发展的要求日益迫切。裂缝型油气储层以构造裂缝为主,构造裂缝发育区带的预测,是裂缝型油气藏勘探的重要组成部分,而构造应力场数值模拟是构造裂缝发育区带预测的有效手段。弹—塑性增量法构造应力场数值模拟,不仅更加逼近岩体的塑性变形过程,而且充分考虑了地质体的非均质性,使得在结合区域地质演化背景的构造应力场数值模拟,能够充分反映地质体曾遭受过的构造改造强度。通过对北大港构造带东翼东营组弹—塑性增量法古构造应力场(构造事件年龄33.7—23.5Ma)数值模拟,发现构造剪应力分布特征与目前油气勘探成果非常一致,即已探明油气藏均位于应力释放区(与构造裂缝发育区相对应),并据此预测北大港构造带东翼的中部还发育有一条近SN向构造裂缝发育区带,是该地区下一步优选的勘探目标。In the case of more and more serious energy crisis, along with the deepgoing petroleum & gas exploration and development, it is desired urgently for the exploring technology for fractured reservoir. The fractured reservoir is built up mainly by structural fracture, so structural fracture estimating is very important. And the tectonic stress field modeling is the most available approach for structural fracture estimating. The modeling with the elastic-plastic increment mode not only can model approximately the plastic deformation of geologic body, but also can consider the nonuniformity of the geologic body, so the modeling under the regional geologic evolution will indicate more closely the tectonic intensity. The modeling results in Dongying Formation in the eastern limb North Dagang Structural Zone show that the shearing stress distribution can accordingly indicate the petroleum assembling locations, so it is estimated that there is a meridional structural fracture developing zone in the middle of the eastern limb of the North Dagang Structural Zone, which will be the advantageous exploration target in future.

关 键 词：构造应力场 弹塑性增量法 构造裂缝 勘探目标 

分 类 号：P631.4[天文地球—地质矿产勘探]