鄂尔多斯盆地Z区长8超低渗透率储层地应力特征研究  

Characteristics of Geostress in Ultra-low Permeability Reservoirs in Chang 8of Z Area in Ordos Basin

作　　者：赵军龙[1] 孙鹏[1] 蔡振东[1] 何小菊 

机构地区：[1]西安石油大学地球科学与工程学院,陕西西安710065 [2]中国石油集团测井有限公司长庆事业部,陕西高陵710200

出　　处：《测井技术》2015年第1期72-77,共6页Well Logging Technology

基　　金：国土资源部煤炭资源勘查与综合利用重点实验室开发课题资助(KF2014-3)

摘　　要：基于大量的文献调研分析,归纳总结了基于测井信息的地应力预测方法,结合研究区资料开展了鄂尔多斯盆地Z区长8储层地应力剖面的建立及地应力平面分布特征研究。地应力预测的关键在于地层孔隙压力、垂向应力及水平应力的估算。地层孔隙压力的估算方法包括等效深度法等3种方法;垂向应力的估算方法是基于瑞士地质学家Heim提出的方法;水平应力估算根据单轴应变模型等4种模型。研究区垂向应力估算采用了Heim法;最小水平应力估算采用了单轴应变模型中的Newberry模型;最大水平应力估算利用双井径测井资料的方法进行计算,最终建立该区长8超低渗透率储层地应力剖面。基于单井地应力数据统计分析,研究揭示了长8超低渗透率储层地应力平面特征;依据研究区地应力平面等值线特征,该区开发井的井排方向设计应选择西西北—东东南方向。由于目的层垂向应力平面分布呈现非均匀性特征,注水压力设计也应参考实际的地应力非均质性特点。Based on large literature research analyses, firstly, we summarize the effect factors and general measurement methods of geostress secondly, summarize the geostress forecast method which is based on the measuring wells information then combined with district information, we establish chang 8 reservoir＇s geostress plane and geostress distribution features. Research indicates that the key problem of forecasting geostress is formation pore pressure estimation, vertical geostress and the level geostress estimation. Estimation of formation pore pressure includes 3 kinds of methods, such as equivalent depth method, etc. ~ Based on Switzerland geologist Heim method, estimation of vertical stress is proposed~ according to single axis strain model, etc. , estimation method of level stress is proposed. In the researched area, Heim method is used to estimate vertical geostress, and Newberry model of single axis strain model is used to estimate minimum level stress, and double well trail logging data is used to estimate maximum level geostress. Geostress plane of Chang 8 super low permeability reservoir is established in the above area. Based on the statistics analysis of single well data, research reveals the isogram feature of crustal stress in this area. The well array should be designed along the orientation of NWW-SEE in the light of the isogram feature of crustal stress. Moreover, the design of pouring water pressure should refer to the vertical stress feature.

关 键 词：测井解释 地应力 超低渗透率 地层孔隙压力 鄂尔多斯盆地 

分 类 号：P631.84[天文地球—地质矿产勘探]