滨里海盆地东南部D区块盐下成藏条件及勘探潜力

On hydrocarbon accumulation conditions and exploration potential of sub-salt in block D in southeast Pre-Caspian Basin

对D区块盐下层系油气成藏条件进行了系统分析。盐下发育的滨岸—海相页岩和碳酸盐岩为盐下层系的烃源岩,盐下发育2套储集岩体系,下二叠统孔谷阶厚层盐岩为盐下层系油气的区域性盖层,发育自生自储和下生上储2套生储盖组合。圈闭类型以低幅度的背斜构造为主。对盐下有利目标进行构造解释,落实局部构造8个,总圈闭面积450 km2,资源量8.6×108t,显示了D区块盐下具有较大的资源潜力。

Hydrocarbon accumulation conditions of the sub-salt in the Adasiki block were studied systematically ： source rocks were shore-marine shale and carbonate of the sub-salt; the sub-salt was of two sets of reservoir rocks ; Lower Permian Kungurian was the re- gional cap; the two reservoir combination modes were ＂self-generation and self-storage＂ and ＂lower-generation and upper storage＂; the main types of the trap were the low-amplitude anticline. Through interpreting the favorable target in the sub-sah, the author determined eight structures with an area of 450 km^2 and 8.6×10^8 t in reserve.