沧东凹陷斜坡带孔二段油气富集规律

Hydrocarbon Accumulation Law of the Second Member of Kongdian Formation in the Slope Zones of Cangdong Sag

沧东凹陷斜坡带是岩性油藏和致密油藏下一步勘探的主要区带。根据成因特点将孔二段时期广泛分布的斜坡带划分为2类:继承型斜坡和反转型斜坡。在孔二段油气成藏条件分析的基础上,研究了2类斜坡带油气富集规律。结果表明:不同斜坡带具有不同的油气空间分布特征,从斜坡低部位向斜坡高部位,继承型斜坡依次为致密油藏—岩性油藏—构造油藏,反转型斜坡依次为岩性油藏—致密油藏—构造油藏。

The slope zones are the main exploration areas for the lithologic reservoirs and tight reservoirs in Cangdong Sag. According totheir genetic characteristics, the slope zones widely distributing in the second member of Kongdian Formation can be divided into 2types ： inheritance slope and reverse slope. The hydrocarbon accumulation laws of two types of slope zone are studied based on the anal-ysis of hydrocarbon accumulation conditions. It is shown that the different types of slope zone have different oil and gas spatial distribu-tion characteristics, from the lower part to the higher position of slope, tight reservoir, lithologic reservoir and structural reservoir distrib-ute in turn in the inheritance slopes, and lithol0gic reservoir, tight reservoir and structural reservoir distribute in turn the inversionslopes.