摘要
地应力测试是获得地应力数据的直接手段 ,理论上它比其它方法有更高的精度 ,但它却存在明显的不足 :1测量数据有限 ,不能得到连续地应力剖面 ;2成本高 ;3对有的地层 (如特薄层 )不能进行地应力实测 ;4分层地应力测试困难。在四川成都洛带地区 ,根据对地应力分布规律和影响它的诸多因素的分析 ,引用前人的研究成果 ,充分利用测井信息 ,建立地应力计算的半经验公式模型 ,利用测井资料确定模型中的各参数 ,不仅可以方便迅速得到沿深度连续分布的地应力剖面 ,而且节约了昂贵的地应力测试费用 。
The research of earth stress during the petroleum exploration and development is an important theoretical subject and a practical problem in the international petroleum field. It has been identified by recent researches: the development and evolution of petroliferous basin structure are the result which is caused by stress field. Earth stress is one of the main causes of the petroleum migration and gathering. The reservoir fracture, fault and structure caused by earth stress are the paths of petroleum migration and the fields of gathering. Earth stress test is the direct way to obtain earth stress data, which is more accurate than any other methods, but still has some obvious disadvantages: ① Continuous earth stress profiles are not easy to get due to limited data; ② The measuring cost is higher; ③ Some beds (such as extremely thin bed) earth stress is unable to be tested; ④ To test the layered beds is difficult too. In this article, according to analysis of earth stress distribution and many influencing factors, the prior researchers achievements and log information are used to build the model of half experiential formula to calculate the earth stress in the Luodai area in Chengdu. On the basis of well logging information to determine the parameters, this model is not only convenient and quick to get the continuous earth stress distribution profiles along the depths but also save the expensive cost of earth stress tests. So this method has obvious economical and practical worth.
出处
《测井技术》
CAS
CSCD
2001年第6期467-472,共6页
Well Logging Technology
