影响高演化泥岩盖层封闭性的主控因素分析

一般认为泥岩盖层的封闭性随着成岩作用的加深而变差,但是大量油气藏发现和实验测试结果证明高演化泥岩仍具有较高的突破压力和较好的油气封闭性.影响高演化泥岩盖层封闭性的主要因素是什么？如何确定高演化泥岩盖层产生破裂的边界条件,一直是影响其有效性评价的重要基础问题,本文通过对野外泥岩中脉体的包裹体测温,结合地层埋藏史恢复,重建...

Controlling Factors Affect Sealing Capability of Muddy Cap Rock at High Evolutionary Stage

It is considered commonly that the sealing capability of muddy cap rock becomes worse coupled with its deepening diagenesis. However, a lot of hydrocarbon discoveries and test results proof that muddy cap rock at high evolutionary stage has high breakthrough pressure and good sealing capability .What is the controlling factors affect the sealing capability of muddy cap rock and How to determine the developmental boundary condition of cracks in muddy cap rock are basic problems that constraint the effectiveness evaluation of cap rock. According to fluid inclusion thermometry in veins existed in mudstone, combined with restore of buried history, the formation time of veins in different layers have been determined. The results show that younger cap rocks break firstly, and older cap rocks break latterly. The results proof that the development of cracks in muddy cap rock have relation with uplift magnitude. The rocks will break at certain depth. The breaking process of mudstone in the process of uplift has been molded using triaxial stress test, the results of which show that mudstone at high evolutionary stage has plasticity property and good sealing capacity in some buried depth. The development of cracks in cap rocks has relation with buried depth and change of maximum main stress difference.