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Prediction of exploration targets based on integrated analyses of source rock and simulated hydrocarbon migration direction: a case study from the gentle slope of Shulu Sag, Bohai Bay Basin, northern China

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Abstract

The Shulu Sag which is a rifted sag with NNE trend is located in the south of Jizhong Depression, Bohai Bay Basin, northern China. The gentle slope and three troughs are situated in the west and east of the sag, respectively. Both of the lower part of Shasan Member (Es3x) and the lower part of Shayi Member (Es1x) act as source rocks in this sag. Researches on the type, quantity, quality and thermal maturity of the respective organic matter have been conducted using Rock-Eval pyrolysis data. Type II is the dominant kerogen in Es1x of all troughs. However, Type II1 and III is the dominant kerogen in Es3x of Middle-Southern and Northern trough, respectively. TOC (total organic carbon) and pyrolysis S2 (hydrocarbon) values suggest that the Es1x source rocks in Middle-Southern and Northern trough are fair to good and poor to fair generative potential of hydrocarbon, separately. The Es3x source rocks in Middle-Southern and Northern trough possess fair to excellent and poor to fair generative potential of hydrocarbon, individually. Tmax (pyrolysis temperature at maximum S2) values indicate that most of Es3x samples are thermally mature, but all Es1x samples are thermally immature. Under large scale condition, the hydrocarbon secondary migration in the upper part of Shasan Member (Es3s), Shaer Member (Es2) and the upper part of Shayi Member (Es1s) have been simulated using fluid potential model with Arcgis 9.3 software. The simulation results reveal the direction of hydrocarbon secondary migration and the distribution of hydrocarbon migration-accumulation units (HMAUS), and also suggest that the hydrocarbon migration direction is obviously controlled by nose-like structure belts where most of hydrocarbons accumulate. That shows high reliability because they are consistent with the hydrocarbon exploration result in this area. On the basis of integrated analyses of source rocks and hydrocarbon migration direction, the following five areas in the gentle slope are identified to be the preferred hydrocarbon accumulation area: Taijiazhuang area, northern and southern Xicaogu area, as well as northern and southern Leijiazhuang area. It is considerably helpful to reduce the risk in hydrocarbon exploration of Shulu Sag.

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Authors and Affiliations

  1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, 102249, China

    Changqing Ren, Fugui He & Xianzhi Gao

  2. College of Geosciences, China University of Petroleum, No. 18 Fuxue Road, Changping, Beijing, 102249, China

    Changqing Ren, Fugui He & Xianzhi Gao

  3. College of Geosciences, Yangtze University, Wuhan, Hubei, 430100, China

    Dongsheng Wu

  4. Engineering and Technology College of Yangtze University, Jingzhou, Hubei, 434020, China

    Wenli Yao

  5. Huabei Oilfield Branch Company, PetroChina, Renqiu, Hebei, 062550, China

    Jianzhang Tian, Huiping Guo, Yuanxin Huang & Li Wang

  6. Nanpu Oilfield Operation Distric of Jidong Oilfield Company, Petrochina, Tangshan, Hebei, 063200, China

    Han Feng

  7. Tianjin Branch Company of China National Offshore Oil Corporation, Tianjin, 300452, China

    Junwei Li

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  1. Changqing Ren
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Correspondence to Fugui He.

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Ren, C., He, F., Gao, X. et al. Prediction of exploration targets based on integrated analyses of source rock and simulated hydrocarbon migration direction: a case study from the gentle slope of Shulu Sag, Bohai Bay Basin, northern China. Geosci J 23, 977–989 (2019). https://doi.org/10.1007/s12303-018-0078-0

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