Characteristics and Origin Classification of the Oils from the Lower Section of the 4th Member of Shahejie Formation and Kongdian Formation in the Southern Slope of Dongying Depression, Bohai Bay Basin

Abstract

Abstract:

The lower section of the 4th member of Shahejie Formation and Kongdian Formation is a suite of purplish red and red clastic sediments in the southern slope of Dongying Depression which can not generate mass hydrocarbons. Therefore, it is significant to discuss the oil origin of the layers. Based on the biomarker characteristics analyses of the 17 oil sands and 5 crude oils, the origin of oils found in the study area was classified into four classes. Class-Ⅰ oil distributes in Pingfangwang area and Boxing subsag, being characterized by Pr/Ph>0.8, Ph/nC18<0.6, an extremely low content of gammacerane, a relatively high content of 4-methyl steranes and diasteranes and relatively high ratios of Ts/Tm and hopanes/steranes, which reflects the oil may come from a suite of mudstone rich in clay minerals deposited in the fresh water lacustrine environment. Class-Ⅱ oil distributes in Chunhua-Lean and Chenguanzhuang structural belt, characterized by Pr/Ph<0.6, Ph/nC18>2, a high content of gammacerane, a low content of 4-methyl steranes and diasteranes and relatively low ratios of Ts/Tm and hopanes/steranes, which indicates the oil sourced from a suite of mudstone or lime mudstone deposited in salt lacustrine environment. ClassⅢ oil distributes in the northern gentle slope structural belt of Qingcheng, characterized by the detection of 25-norhopanes and a middle content of gammacerane, which shows it is mixture of few biodegradated Class-Ⅱ oil charged in early stage and mass Class-Ⅰ oil charged in late stages. Class-Ⅳ oil distributes in Kongdian Formation of Wangjiagang area, characterized by an absolute predominant content of C₂9 steranes and a high content of gammacerane, which reveals the oil is mixture of Class-Ⅱ oil and the oil generated by shallow lake-swamp facies source rock.

CLC Number:

TE122

MENG Jiang-hui,LIU Luo-fu,JIANG Zhen-xue,GAO Yong-jin. Characteristics and Origin Classification of the Oils from the Lower Section of the 4th Member of Shahejie Formation and Kongdian Formation in the Southern Slope of Dongying Depression, Bohai Bay Basin[J]. Geoscience, 2010, 24(6): 1085-1092.

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Characteristics and Origin Classification of the Oils from the Lower Section of the 4th Member of Shahejie Formation and Kongdian Formation in the Southern Slope of Dongying Depression, Bohai Bay Basin

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