陕北斜坡东部延长组油气成藏控制因素

陕北斜坡东部延长组油气勘探目的层系为长2油层组和长6油层组,属典型的低渗—超低渗储层;富含有机质的烃源岩为油气的生成提供了物质保障;广泛发育的泛滥平原相、沼泽相泥岩为油气成藏提供了良好的盖层条件。通过研究认为延长组油气成藏类型以构造—岩性复合油气藏为主,含油气性主要受物性、岩性及岩相等因素影响。有利的沉积相带、运移输导条件及鼻状隆起构造共同控制了延长组主力油层的分布。

RESERVOIR FORMING CONDITIONS AND ENRICHMENT RULES OF YANCHANG FORMATION IN THE EAST PART OF NORTH SHAANXI SLOPE

Chang2 group and chang6 group are purpose reservoir groups of oil and gas exploration in the east part of north of Shanxi Province slope.The reservoir group is typical low and ultra low penetration.Material security has been offered from hydrocarbon source rock of containing organic matter for the generation of oil and gas.The flood plain faces and swamp faces mudstone provided a good cap rock conditions for reservoir forming.The results show that the main type of reservoir forming is structural-lithologic reservoirs.The capability of bearing oil and gas has been controlled by reservoir properties,lithologies and lithofacies.The sedimentary face zone,reservoir physical properties,nose fold background and the condition of hydrocarbon migration carrier are the main factors of control hydrocarbon accumulation.