东濮凹陷调节构造特征

应用调节构造理论，以断层生长分析为基础，在东濮凹陷识别出3大类共13个调节构造。同向型调节构造主要分布于分段活动的兰聊断层各断层段连接处及雁列型排列的长垣断层系内各断层叠覆段，其几何形态分别表现为断鼻及与断层斜交的斜坡，起到分隔凹陷东部与西部洼陷带的作用；对向型调节构造主要由倾向相对的兰聊断层各断层段与长垣断层各断层（段）叠覆形成，表现为较为完整的背斜形态，是凹陷中央隆起带的组成部分；背向型调节构造发育于凹陷中央隆起带上倾向相反的断层叠覆带，表现为条形凸起，与对向平行型调节构造叠加在一起。该区调节构造主要与东西边界断层（系）在分段期的相互作用有关。调节构造作为凹陷中相对高地势带并分隔半地堑，从多个方向邻近烃源，是有利的油气勘探目标。

Characteristics of accommodation structures in Dongpu Sag

Three types and 13 accommodation structures( AS) are identified in Dongpu Sag on the basis of fault growth analysis with the application of accommodation structure theory. Synthetic AS develops on the locations where fault segments connected in Lan - Li-ao Fault and the faults overlap in an echelon fault system. These structures separate eastern and western sub - sag zones with the geometry of faulted nose and slope oblique to the faults. Opposite AS are overlapped by the fault segments of Lan - Liao Fault, showing geometry of relatively entire anticlines, which is the part of central uplift belt of the sag. Antithetic AS develop between o-verlapping faults with opposite dip on the central uplift belt, which usually superpose on the opposite parallel accommodation structures as strip arch. The accommodation structures originate from the interaction of east and west border fault systems in fragment periods in the sag. They separate half - grabens as high relief. They are potential targets for hydrocarbon exploration because of hydrocarbon source nearby in several directions.