米仓山东段-大巴山前缘圈闭构造样式分析

从区域构造分析和地震剖面解释入手,通过野外地质调查、地震资料解释、典型剖面构造分析,确定了米仓山东段-大巴山区域应力方向,探讨了区域构造演化特征,重点解析了构造样式特征.通过界牌1井和磨子坪-瓦房湾局部构造分析,认为:(1)圈闭主要为背斜圈闭,圈闭受构造控制,断层对圈闭的控制作用表现为完整的背斜圈闭向断鼻圈闭转化,分化构造高点,构造裂缝发育;(2)界牌1井为低幅背斜圈闭(断鼻圈闭),其断层可能不具有封堵性,因此未能形成工业性油气流;(3)磨子坪-瓦房湾区块发育一系列构造规模中等、背斜圈闭完整、闭合度高、面积大的圈闭.

A structural style analysis of the eastern Micangshan and Dabashan foreland zone, China

Based on a regional tectonic analysis and seismic profile interpretation and by surface geology survey,seismic data interpretation and representative section structure analysis,the authors detemine the direction of stress,discuss the characteristics of tectonic evolution and emphatically analyse the structural style.Through analyzing the local structure of Well Jiepai 1 and Moziping-Wafangwan,the authors draw the following coclusions.(1)The traps are mainly anticline traps controlled by structure.The control of faults over traps made the full anticline traps transformed into fault traps.(2)The traps of the Well Jiepai 1 is a low-range anticline trap and fault trap.Weather the fault has seal not sure,so the trap has not preserved well and has not formed the industry oil-well.(3)In the middle of the area,there are a series of anticline-traps,the closure is thick,the acreage is large,and the structure fractures develop on the trap.