Hydrocarbon distribution and accumulation model in the south of Lixian slope, Raoyang subbasin

Abstract

The exploration level in the south of Lixian (蠡县) slope is relatively low that causes the hydrocarbon distribution pattern and hydrocarbon accumulation model of discovered reservoirs unclear. It was assumed that the hydrocarbon accumulation model was mainly “stepped-like” type, but this model is contradicted with newly discovered reservoirs. Through comprehensive study of faults activity stages and depositional system, it can be concluded that the late period developed and late period attenuation faults act as the vertical migration path, while connected sandbodies provide lateral migration path for oil and gas. Combining with the distribution of the known reservoirs and oil-source correlation, the hydrocarbon accumulation model in the south of Lixian slope is characterized by dual source rocks generating; connected sandbodies parallel transporting; shallow fault nose traps accumulating. This model reveals the direction and clue of the following exploration and development, which are based on shallow formation; finding subtle structure traps by fine seismic interpretation and accurate sedimentary microfacies characterization.

Keywords

south of Lixian slope / hydrocarbon distribution / hydrocarbon accumulation model / parallel migration

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