江汉盆地潜江凹陷潜江组岩性油藏勘探方向及对策

EXPLORATION DIRECTION AND STRATEGY FOR LITHOLOGIC ACCUMULATIONS IN QIANJIANG FORMATION OF THE QIANJIANG SAG,JIANGHAN BASIN

潜江凹陷位于江汉盆地中部,是江汉盆地油气最为富集的富烃凹陷。潜江组勘探程度高,岩性油藏已成为主要的勘探对象与目标。该文通过对潜江组岩性油藏发育条件、分布规律及主控因素的分析,指出潜江凹陷构造斜坡带、构造反转区、断裂发育带及挠曲带是岩性油藏的有利勘探方向。发展高分辨率三维地震、建立以相控砂体预测为核心的岩性圈闭识别与评价技术,推广薄油层改造技术是深化潜江盐湖岩性油藏勘探的主要对策与方法。

The Qiangjiang Sag lies in the central part of the Jianghan Basin and is the most proliferous depression for hydrocarbon accumulation in the basin.The Qianjiang Formation has been maturely explored,so the litho-logic hydrocarbon accumulations now become the primary exploration targets.In this paper,based on analysis of development and distribution of lithologic hydrocarbon accumulations in the Qianjiang Formation,it is suggested that the favorable lithlogic hydrocarbon accumulations occur in structural slope belts,structural reverse areas,fault-developed belts and flextural belts.The main strategy and method for further exploration of the lithologic accumulations in the Qianjiang salt lake basin are to develop technologies for identification and evaluation of lithologic traps and to develop techniques for rework of thin-bedded oil layers,through development of high-resolution 3-D seismic technologies.