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利用回剥原理,采用盆地模拟技术,选择东、西两条剖面对库车坳陷不同构造带典型井的沉降史进行了对比研究。结果表明,克拉苏构造带早期相对深埋、晚期持续深埋;秋里塔格构造带早期浅埋、晚期快速深埋;前缘隆起带早期缓慢浅埋、晚期相对浅埋。库车坳陷不同构造带的构造活动和沉降差异性导致其储层孔隙度差异明显。这种沉降差异性反映出由北向南从克拉苏构造带到前缘隆起带储层经历的深埋时间和最大埋深由大变小,储层在埋藏过程中所受的成岩压实作用由强变弱、孔隙度由小变大。时间深度指数定量地反映了这种沉降差异性及其对孔隙度的影响。
By using the back-stripping principle and using the basin simulation technology, the authors selected the east and west sections to compare the settlement history of typical wells in different tectonic belts in the Kuqa Depression. The results show that the Kelasu tectonic belt was relatively deep buried in the early stage and continued to be deeply buried in the late stage. The Qiulitage tectonic belt was shallow buried at early stage and rapidly buried at the late stage. The frontier uplifted belt was shallow and shallow at early stage and relatively shallow at late stage. The differences of tectonic activities and subsidence of different tectonic belts in Kuqa Depression caused the obvious difference of reservoir porosity. This difference in subsidence reflects the fact that the deep-buried time and the maximum buried depth experienced by the reservoir from the north to the south from the Kelassu tectonic belt to the frontier uplift zone decrease from large to small. The diagenetic compaction suffered by the reservoir during the burial process is controlled by Strong weakening, porosity from small to large. The time depth index quantitatively reflects this difference in sedimentation and its effect on porosity.