辽河西部凹陷西南部沙一、二段沉积体系与层序地层特征

在调查研究的基础上，对辽河西部凹陷西南地区沙一、二段沉积体系及层序地层特征进行了论述。研究认为：该区沙一、二段沉积体系为辫状河三角洲，并组成了一个完整的I型三级层序，其中低位体系域主要由辫状河、辫状河三角洲平原及前缘组成，沉积作用以加积为主；湖侵体系域由辫状河三角洲前缘、前三角洲及浅湖组成，以退积为主；而高位体系域由辫状河三角洲前缘与湖相组成，以进积为主。同时认为，低位体系域成藏条件好，是本区有利的勘探目标。

Sedimentary system and sequence stratigraphy of s1 and s2 member in southwest of Liaohe western depression

This paper discusses the sedimentary system and sequence stratigraphy of S 1 and s 2 member in southwest of Liaohe western depression on the basis of investigation.The study shows that.sedimentary system of s 1 and s 2 member was braid fiver delta,which was a complete sequence of type I of the third level; the low-stand system tract mainly consisted of braid fiver, braid river delta plain and front,with aggradation as major form of sedimentation;lake transgressive system tract consisted of braid river delta front,predelta and shallow lake,with retrogradation as the major form;high-stand system tract consisted of braid river delta front and lacustrine facies.with progradation as the major form.In the meantime,it is thought that the low-stand system has good reservoir forming conditions,and is a favorable exploration target in this area.