【作者】 李振生； 刘德良； 杨晓勇；

【Author】 LI Zhen-sheng LIU De-Bang YANG Xiao-yong College of Earth and Space Sciences,China University of Science and Technology,Hefei 230026,China)

【机构】 中国科学技术大学地球与空间科学学院；

【摘要】 库车前陆盆地发育多种性质的断裂,断裂对天然气的运移、聚集和储存的作用为：①库车盆地非能干层本身具有极强的封盖能力,而沿其发育的顺层断层和滑脱断层极大地增强了原来岩石的封盖能力。膏盐质断层岩与原岩相比,孔隙度降低5%,渗透率降低高达78%。②高角度的逆冲断层和横向走滑断层具有侧向分隔作用。③高角度的走滑断层和正断层具有垂向疏导作用,库车盆地北部,因走滑断层带多出露地表,油气容易沿其边部的裂隙带垂向运移至地表而散失,其附近无油气藏分布；盆地南部的前缘隆起,反向倾滑正断层居于第三系膏泥岩区域盖层之下,破坏了原生油气藏形成次生油气藏。④库车盆地断裂伴生褶皱提供了大量的构造圈闭条件；断裂派生节理主要发育在非能干层间夹的能干层中,改善其原有的储集性能。中国中西部许多地区与库车前陆盆地具有相似的地质条件,充分认识库车盆地断裂对天然气藏的控制作用,有助于其他相似地区的油气预测,提高油气藏发现的机遇。更多还原

【Abstract】 The controlling actions for faults to hydrocarbon in Kuqa foreland basin are as follows:①Slip faults and overthrust faults, which grow in ductile layers,intensify enormously the sealing ability of the ductile layers.Compared deformed gypsum rock with non- deformed gypsum rock,the decrease of porosity is only 5%,but that of permeability is as high as 78%.②high-angle thrust faults and shear faults are laterally sealed.③high-angle strike-slip faults and normal faults are vertically flown.In the north of Kuqa basin,there are no hydrocarbon reservoirs near strike-slip faults,because they crop out and hydrocarbons are lost along their fracture zones;in the south,the primary hydrocarbon reservoirs were destroyed to form secondary hydrocarbon reservoirs because normal faults were under Tertiary gypsum stratum.④A mass of structural traps are associated folds with faults;associated fractures with faults,which mostly de- velop in brittle lays among ductile lays,improve its reservoir ability.Because there are many areas in Midwest China which have similar geologic conditions,it helps hydrocarbon to forecast and raise the opportunity finding overpressure oil and gas reservoirs that control ac- tions for faults to hydrocarbon reservoirs are fully understood.更多还原