莺—琼盆地热流体活动示踪标志及其油气运聚指向意义

TRACE MARKERS OF THERMAL FLUID FLOW IN YING—QIONG BASIN AND THEIR DIRECTIONAL SIGNIFICANCE OF HYDROCARBON MIGRATION AND ACCUMULATION

莺—琼盆地是世界上的一个独特沉积盆地 ,普遍发育高温高压 ,具有强烈而频繁的热流体活动。研究表明 ,沉积盆地内的热流体活动过程 ,实质上是一个在压力系统这一主要驱动机制作用下的流体聚散动平衡过程。为了清楚地认识莺—琼盆地中的这一过程 ,更好地服务于油气的勘探和开发 ,本文阐述了热流体活动在地震响应、地化指标、流体包裹体等示踪标志上的表现 ,进而追踪莺—琼盆地中的热流体活动 ,并指出作为油气载体的热流体的各种示踪标志 ,在油气运聚动平衡过程中指示了油气运聚发生的路径和方向。综合应用各种热流体活动示踪标志 ,有助于进行油气运聚成藏的过程分析。

Ying - Qiong Basin is an unique sedimentary basin in the world, having high temperature, high formation pressure and intensive and frequent thermal fluid flow. Through studying it is indicated that in sedimentary basin the thermal fluid flowing process belongs to a dynamic balance between accumulation and dispersion under the action of the principal drive mechanism formed by pressure system essentially. In order to understand such a process in Ying - Qiong Basin clearly to serve well for oil and gas exploration and development, in the paper, the expression of the thermal fluid flow in trace markers as seismic response, geochemical index and fluid inclusion is stated, thus tracing out the thermal fluid flow in Ying - Qiong basin; and the paths and direction of hydrocarbon migration and accumulation in the dynamic balance between accumulation and dispersion are pointed out by use of various trace markers of the thermal fluid flow which is taken as hydrocarbon carrier. It is contributive to analyzing the process of reservoir formation to apply comprehensively various trace markers of the thermal fluid flow.