松南西部斜坡区层序地层格架中的油气勘探模型

陆相盆地层序的发育是在湖盆蓄水量周期性变化条件下实现的。层序发育过程实际上是代表在湖水进-退的背景下湖泊冲积沉积作用彼此消长的过程。油气成藏与烃源岩的形成及储集体的发育有关。三维层序地层格架为烃源岩和储集体的配置提供了约束，形成了各种类型的圈闭,从勘探角度可称为油气勘探模型。松南西部斜坡区划分出2个巨层序、4个超层序和8个层序。层序Ⅵ由湖进体系域、高水位体系域和湖退体系域组成，本文即以此为例，论述层序地层格架中的油气勘探模型。模型Ⅰ、Ⅱ、Ⅲ分别对应于湖退体系域、高水位体系域和湖进体系域，其中湖进体系域、高水位体系域可作为主要的烃源岩，而湖退体系域可提供储集岩。

EXPLORATION MODEL OF OIL AND GAS IN SEQUENCE STRATIGRAPHIC FRAMEWORK IN WESTERN SLOPE REGION OF SOUTHERN SONGLIAO BASIN

Evolution of the sedimentary sequences of the continental basins reflects the periodic changes of lake water regime. Thus the reacting sequence of the lacustrine deposits expresses the genetic history of the oil and gas pool. The orientation and location of the oil and gas pool as well as the characteristics of the reservoir could be managed as the exploration model. Our present work of the western slope region in the southern Songliao Basin, as shown here, is taken as an example.The western slope region in southern Songliao Basin is divided into two megasequences, four supersequences and eight sequences. Sequence Ⅵ consists of RST ,HST and TST which correspond to model Ⅰ,model Ⅱ,and model Ⅲ respectively. TST and HST can be taken for the source rock and RST can be regarded as the reservoir rock.