泌阳凹陷梨树凹地区近岸水下扇沉积特征与成藏模式

Sedimentary Characteristics and Hydrocarbon Accumulation Models of Inshore Submarine Fans

以泌阳凹陷南部陡坡带梨树凹地区为例,利用研究区丰富的录井、测井、岩心、分析化验、地震资料,从构造特征、沉积相、油藏精细解剖入手,开展了东部砂体沉积特征与成藏模式研究。研究表明:梨树凹地区主要发育近岸水下扇,具备较好的油气成藏条件,油气成藏主要受烃源岩条件、沉积相带与构造因素的控制;近岸水下扇油藏有2种成藏模式,一种是深层扇根物性封堵、扇中油气聚集的物性封堵型成藏模式;另一种是浅层鼻状构造与扇中砂体配置形成构造+物性控制型成藏模式。近岸水下扇油藏是泌阳凹陷下步油气勘探的重要领域。该研究对泌阳凹陷小型砂砾岩体后续勘探有一定的指导意义。

In this paper, Lishuwa area at the slope beh in the south of Biyang sag was taken as the example to study the sedimentary characteristics and hydrocarbon accumulation models of sandbodies in the east from the aspects of structural characteristics, sedimentary facies and fine oil reservoir dissection by using abundant mud log, logging, core, assay and seismic data of the study area. It is indicated that in Lishuwa area, inshore submarine t^m is mainly developed and hydrocarbon accumulation conditions are good. The hydrocarbon accumulation is mainly controlled by source rock conditions, sedimentary facies belts and structural factors. The oil reservoirs of inshore submarine fans are formed in two models. One is physical-property sealing model. And in this model, the upper fan in the deep layer provides physical-property sealing and hydrocarbon accumulates at the mid fan. The other is structure ＋ phys- ical-property control model which consists of nose-like structure in the shallow layer and sandbody at mid fan. The oil reservoirs of inshore submarine fans are the important oil and gas exploration targets in Biyang sag in the follow- ing stage. The research results can be used as the reference for the subsequent exploration of small glutenite masses in Biyang sag.