渤南洼陷沙四上亚段碳酸盐岩成藏条件与勘探潜力

doi:10.11743/ogg20130203

Abstract

Abstract:

A lacustrine carbonate sequence composed of limestone,marl,lime mudstone and gypsiferous mudstone is developed widely in the upper Es⁴ (the 4^th member of the Paleogene Shahejie Fm) and acts as important source rocks in Bonan Sag of northern Huanghe Delta.The source rocks are 20 m to100 m thick with the maximum thickness at Kenxi and Yidong.Rich in sapropel-type organic matters,the rocks are of excellent quality.The source rocks generated hydrocarbon earilier than that of mudstone at the same sequence and reached hydrocarbon generation peak when R_o is about 0.6%.The crude samples show a feature of high homohopane (C₃₅/C₃₄) ratio and high abundance of 4-methylsterane and sulfur content.There were two important stages for oil accumulation:the end of Ed to Ng and the end of Ng to Nm.It is suggested that the carbonates of the upper Es⁴,the fan-delta and beach-bar sandstoneas well as the lower Es⁴ in juxtaposition the oil source rocks in the deep sag,be considered favorable exploration targets.

Key words: timing of hydrocarbon accumulation, exploration potential, hydrocarbon source rock, carbonate rock, Shahejie Formation, Bonan Sag

CLC Number:

TE112.2

Lin Huixi, Peng Suping, Du Wenfeng, Kong Xiangxing. Hydrocarbon accumulation conditions and prospecting potentials of carbonate rocks in the Upper Es⁴ of Bonan Sag[J]. Oil & Gas Geology, 2013, 34(2): 161-166.

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Hydrocarbon accumulation conditions and prospecting potentials of carbonate rocks in the Upper Es⁴ of Bonan Sag

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Hydrocarbon accumulation conditions and prospecting potentials of carbonate rocks in the Upper Es4 of Bonan Sag

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Hydrocarbon accumulation conditions and prospecting potentials of carbonate rocks in the Upper Es⁴ of Bonan Sag