松辽盆地岩性油藏形成条件与分布规律研究

松辽盆地中浅层大型坳陷湖盆河流-三角洲、湖泊沉积体系的沉积地质背景决定了其具有形成大面积岩性油藏的地质条件。由于各时期基准面升降造成可容空间在不同时期差别较大,因此在不同地质时期发育的砂类型有一定的差别;同时由于储层埋藏深度以及与烃源岩的相对位置不同,各含油组合隐蔽油气藏成藏的条与分布规律也有一定的差别。针对三角洲前缘相带砂泥岩薄互层岩性油藏的实际情况,开展了薄互层隐蔽油藏预测技术攻关,应用高分辨层序地层学、模式识别以及薄互层隐蔽油气藏地球物理识别预测技术系列对岩性圈闭进行了预测,并取得了较好的效果,优选出几个亿吨级储量规模的勘探目标区,为下一步隐蔽油气藏的勘探指明了方向。

The Formation Conditions and Distribution Regularities of Lithologic Reservoirs in the Songliao Basin

The geological background of the fluvial and lacustrine depository system in the large mid-shallow layered depressed lake in the Songliao Basin has been proven to have the geological conditions for the formation of lithologic reservoirs over a large area. Because the rise and fall of the base level caused considerable differences in the space at different periods, the types of sand bodies varied in different geologic periods; but at the same time, because of the differences in burial depths and the relative differences in positions of the siltstones and source rocks, the formation conditions and distributive regularities for oil-bearing groups of subtle reservoirs also vary accordingly. In view of the reality of the thinly-interbedded lithologic reservoir in the deltaic frontal facies belt, we have conducted a series of research to study the thinly-interbedded subtle reservoirs with the help of high resolution sequence stratigraphy, pattern recognition and the geophysical recognition and prediction techniques for thinly-interbedded subtle reservoirs, thus achieving a better effect and optimizing several exploration target areas, each of which has an oil reserve of about 100 million tons. This has shed light on further exploration of new subtle reservoirs.