库车坳陷构造挤压增压定量评价新方法

New method of quantitative evaluation on pressurization resulted from tectonic compression in Kuqa depression

依据构造压实作用机制,对真实地层条件下构造挤压增压的定量评价方法进行探讨,通过库车坳陷主要构造带封闭系数的评价和喜马拉雅晚期最大主应力的分布模拟,对库车坳陷构造挤压引起的流体增压及其贡献进行评价。结果表明:库车坳陷喜马拉雅晚期构造挤压增压幅度及其贡献在克拉苏地区最大,增压幅度为10～13 MPa,增压贡献为25%～30%;克深地区、东秋地区次之,增压幅度为6～10 MPa,增压贡献为12%～25%;大北地区、迪那地区增压幅度较小,普遍小于3 MPa,增压贡献一般小于5%;塔北隆起英买力地区构造挤压对流体不增压。

Based on compaction effect of tectonic compression,the quantitative evaluation method of pressurization resulted from tectonic compression under truly stratum conditions was investigated.By means of estimation on the sealing coefficient of the main tectonic zone in Kuqa depression and simulation of the maximum principal stress in Kuqa depression in the late Himalaya period,the pressurization amplitude and the contribution resulted from tectonic compression were estimated.The results show that the pressurization amplitude and the contribution of tectonic compression in the late Himalaya period in Kelasu region are the biggest,and secondly in Keshen and Dongqiu regions,and relatively smaller in Dabei and Dina regions.The pressurization amplitudes are 10-13 MPa,6-10 MPa and generally less than 3 MPa respectively in Kelasu region,Keshen and Dongqiu regions,Dabei and Dina regions.The pressurization contributions of tectonic compression are generally 25%-30%,12%-25% and less than 5% respectively in Kelasu region,Keshen and Dongqiu regions,Dabei and Dina regions.The pressurization resulted from tectonic compression is none in Yingmaili region,Tabei uprift.