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

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.