巴楚隆起寒武系层序格架及生储盖组合特征

通过对野外露头剖面、 钻 （测） 井、 地震解释等相关资料的综合分析， 以层序地层学理论为指导， 将塔里木盆地巴楚隆起寒武系划分为 3 个二级层序， 14 个三级层序， 其中二级层序均为 I 型层序， 主要发育海侵体系域和高位体系域， 在寒武纪， 研究区主要表现为局限台地—蒸发台地的交替沉积， 其水体深度西北缘相对较大， 东南部相对较浅。在此基础上根据其体系域发育特征探讨了研究区生储盖发育特征及时空配置规律， 共发育 1 套烃源岩、 3 套储集层、 2 套盖层， 烃源岩为 SS1 海侵体系域， 储层分别为 SS1 高位体系域、 SS2海侵体系域、 SS3 高位体系域和海侵体系域， 盖层分别为 SS1 高位体系域和 SS2 高位体系域， 组成了两套较好的生储盖组合。研究区内野外剖面和钻井岩芯资料显示： 白云岩多数经历过热液改造， 在热液改造强烈的地方溶蚀孔洞较为发育， 因此， 在构造活动强烈的地区， 热液通过断裂运移对原岩进行溶蚀和改造， 易于形成较好的储层， 进而形成较好的油气藏。

The Cambrian Sequence Stratigraphy Framework andSource-Reservoir—Caprock Association of Bachu Uplift in Tarim Basin

Based on comprehensive analysis of the outcrops， wells data， seismic explanation data， and guided withsequence stratigraphy theory， the sequence stratigraphy of Bachu Uplift Cambrian is divided into fourteen 3rd-order sequences and three 2nd-order sequences which belong to type I sequence and were constituted by TST andHST. In the Cambrian period， the sedimentary environment is mainly showed as alternating deposition of restrictedplatform-evaporation platform， the water depth is mainly showed as the northwestern margin is relatively deep andthe southeast is shallow. On the basis of above， this paper discusses the characteristics of source-reservoir-cap rockand its rule of combination on the basis of sequences stratigraphic framework， the results show that there are 1 setof source rock， 3 sets of reservoir and 2 sets of cap developed in the Cambrian in the study area. The source rockis SS1 HST， reservoirs are SS1 HST， SS2 TST， SS3 TST and HST， caps are SS1 HST， SS2 HST. They combinedinto 2 sets of good source-reservoir-caprock assemblages. In addition， most dolomites in the outcrops or in the drillcore have been changed by hydrothermal， and the greater intensity of hydrothermal alteration， the more developeddissolution pores. Therefore， in some of the places where intense tectonic activities happened， hydrothermal thenbegan to change the rock by migration. At last， it formed good reservoirs.