摘要
连续稳态流动和周期性 (幕式 )瞬态流动是沉积盆地流体的 2种流动方式。幕式流体流动是压力和应力的作用引起地层周期性破裂或断裂、先存裂隙周期性开启的结果。幕式成藏是沉积盆地中油气与地层水组成的混相、不连续流体的多期次充注 /聚集过程 ,超压顶界面附近、底辟和深断裂附近是幕式成藏的有利场所。与油气稳态连续聚集过程相比 ,幕式成藏更快 ,大 中型油气田可在较短的时间内形成 ,根据传统模式难以成藏的年轻圈闭可成为有效的勘探目标。幕式流体流动的主要特征是流体成份和流动过程的不连续性、流体流动过程中温度、压力的快速变化及流体流动的多期性和周期性。流体的时空非均质性。
Successive, steady state flow and cyclic (episodic), transient flow were two types of fluid flow in sedimentary basins. Episodic fluid flow resulted from the cyclic fracturing or cyclic opening of existing faults and fractures caused by pressure and stress build up. Episodic petroleum accumulation was processes of the multi stage injections of mixed phase, non continuous fluids composed of hydrocarbons and water in sedimentary basins. Traps near the top surface of the overpressured systems and traps associated with diapirs and faults were favorable places for episodic petroleum accumulation. Compared with petroleum accumulation through steady state, continuous flow, episodic accumulation was much faster, and large and medium sized oil/gas fields could be filled within geologically short period of time. As a result, young traps in which commercial reservoirs could not formed based on traditional model, could become effective exploration target. The main characteristics of episodic fluid flow and petroleum accumulation were non continuity of the fluid composition and flow processes, rapid changes in temperature and pressure during fluid flow and the multi stage and cyclic nature of fluid flow. The compositional heterogeneities of fluids both in space and in time, the transient temperature response of fluid flow, and the migration fractionation as well as the interaction among multi stage fluids reflected by migration fractionation were effective distinguishing markers for episodic petroleum accumulation.
出处
《地质科学》
CAS
CSCD
北大核心
2003年第3期403-412,共10页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
国家杰出青年科学基金项目 (批准号 :4 0 12 50 0 8)
国家自然科学基金重点项目 (批准号 :4 0 2 380 59)资助
