致密砂砾岩有效储层主控因素——以松辽盆地南部A断陷为例

发布时间：2018-07-24 15:06

【摘要】：松辽盆地南部深层下白垩统登娄库组、营城组和上侏罗统沙河子组广泛发育致密砂砾岩,是该区主要的储层。深层致密砂砾岩气藏显现良好的勘探前景,正确认识该类储层是有效开发其油气资源的前提条件。文中应用地质、化验分析和地球物理等方法,以松辽盆地南部A断陷为例,从沉积相带展布、成岩相类型、构造作用等方面,探讨了该区深层致密砂砾岩有效储层形成的主控因素。结果表明:有利沉积相带多发育在扇三角洲前缘亚相和辫状河三角洲前缘亚相;有利成岩相多发育在三角洲前缘水下分流河道,致密强压实相、致密压实-硅质胶结相、致密压实-含方解石胶结相为有利隔层;穹窿、断鼻等构造附近有利于该类储层微裂缝和溶蚀作用的发生,对储层物性具有明显的改善作用。
[Abstract]:Dense gravel rocks are widely developed in the lower Cretaceous Dengloku formation, Yingcheng formation and Shahezi formation of Upper Jurassic in the southern Songliao Basin, which are the main reservoirs in this area. The deep dense conglomerate gas reservoir has a good prospect of exploration, and a correct understanding of this kind of reservoir is a prerequisite for the effective development of its oil and gas resources. Taking A fault depression in the south of Songliao Basin as an example, this paper applies the methods of geology, laboratory analysis and geophysics, from the distribution of sedimentary facies belt, diagenetic facies type, tectonism and so on. The main controlling factors of effective reservoir formation of deep dense sandy gravel in this area are discussed. The results show that favorable sedimentary facies zones are mostly developed in fan delta front subfacies and braided river delta front subfacies, favorable diagenetic facies are mostly developed in delta front underwater distributary channel, dense compaction facies, dense compaction and siliceous cementation facies. The compact compact-calcite cementation phase is a favorable barrier, and the structures near the fornix and fault nose are favorable to the occurrence of microfractures and dissolution in this kind of reservoir, which can improve the physical properties of the reservoir obviously.
【作者单位】：中国石油吉林油田公司勘探开发研究院;
【基金】：国家科技重大专项课题“大型岩性地层油气田/区形成与分布研究”(2011ZX05001-001)
【分类号】：P618.13

【相似文献】