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对在应力场条件下的多层叠置独立含气系统相应调整进行研究.通过对研究区大量水力压裂试井数据统计分析后认为:研究区广泛发育多层叠置独立含气系统,各煤层压力系数在层域呈现波动变化,且部分煤层普遍超压.最小主应力梯度增大,煤层渗透率降低,压力系数增大.各煤层最小主应力梯度表现出波动性,表明各煤层地应力特征有所区别,这与压力系数所表现出的波动性具有一致性.研究结果表明:研究区煤储层在深度300m左右为地应力转换带,在此深度以上,水平应力起主导作用,煤储层物性可能较好,相邻煤层容易形成流体压力主导型的独立含气系统;而在此深度以下,垂直应力起主导作用,煤储层物性变差,相邻煤层流体不易沟通,容易形成地应力主导型的独立含气系统.地应力转换深度的变浅,易形成受地应力调整控制的多层叠置独立含气系统.
Based on the statistical analysis of a large number of hydraulic fracturing well test data in the study area, it is considered that the multi-layered independent gas-bearing system is widely developed in the study area, and the pressure of each coal seam The coefficients fluctuate in the horizon, and some of the coal seams generally overpressure.The minimum principal stress gradient increases, the permeability of the coal seam decreases, and the pressure coefficient increases.The minimum principal stress gradient of each coal seam shows volatility, indicating that the characteristics of the geostress of each coal seam The results show that the coal reservoirs in the study area are geostrophic transition bands at a depth of about 300 m, and above this depth, the horizontal stress plays a leading role. The coal reservoir The physical properties may be better, and the adjacent coal seams easily form the independent pressure system dominated by fluid pressure. Under this depth, the vertical stress plays a leading role and the physical properties of coal reservoirs deteriorate. The adjacent coal seams are not easy to communicate with each other, The dominant type of independent gas-bearing system is that the depth of geo-stress transformation is shallow, and it is easy to form a multi-layered independent gas-bearing system controlled by ground stress.