Hydrocarbon generation potential of the third member of the Shahejie Formation (Es 3 ) of the Bozhong sub-basin, Bohai B
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ORIGINAL PAPER
Hydrocarbon generation potential of the third member of the Shahejie Formation (Es3) of the Bozhong sub-basin, Bohai Bay Basin, Northern China Wei Liu 1 & Lin Ye 1 & Zhenqi Wang 1 & Lifang Liu 2 & Shengbing Huang 2 Received: 18 June 2019 / Accepted: 11 October 2019 # Saudi Society for Geosciences 2019
Abstract Based on the experiment of total organic carbon (TOC), rock pyrolysis, extractable organic matter, and gas chromatography-mass spectrometry (GC-MS), 4 sets of hydrocarbon source rock samples of the third member of the Shahejie Formation (Es3) of the Bozhong sub-basin, Bohai Bay Basin, Northern China, have been tested. The data of TOC and extractable organic material (EOM) content show that the abundance of organic matter of Es3 reached a goodexcellent level. The data of kerogen macerals and Tmax and HI both indicate that the organic matter type was mainly type II, with a small amount of types I and III. The vitrinite reflectance (Ro), Tmax, and methylphenanthrene index (MPI) all show that the maturity of the source rocks of Es3 increased gradually with increasing depth and generally at the low mature-mature stage. The depositional setting was dominated by a transitional oxidation-reduction environment with partial salinization. The salinization of aquatic bodies was conducive to the formation of a good reducing environment. The parent material source of the organic matter in the source rocks of Es3 was dominated by algae and mixed with other lower aquatic organisms and higher plants. Keywords Bozhong sub-basin . High-quality source rock . Hydrocarbon generation potential . Organic preservation condition . Parent material source
Introduction The Bohai Bay Basin is the largest oil-bearing basin in eastern China (Zhang 2000; Li et al. 2013). The Bozhong sub-basin, located in the middle of the Bohai Bay Basin, has an area of about 8660 km2 (Fig. 1). Oil and gas exploration in the Bohai Bay Basin began in the 1960s. From 1975 to 2000, oil and gas production increased rapidly, and the proven reserve rate reached 40.0%. Since 2000, the oil and gas production in the Bohai Bay Basin has entered a stage of steady growth. By the end of 2013, Responsible Editor: Santanu Banerjee * Lin Ye [email protected] 1
School of Geosciences, Yangtze University, Wuhan 430100, Hubei, China
2
China National Offshore Oil Corporation Research Institute, Beijing 100029, China
the proven reserve rates were 51.3% and 12.8%, respectively (Li et al. 2013; Zhao et al. 2015). The Bohai Bay Basin has experienced large-scale oil and gas exploration for nearly 50 years and has entered a stage of deep exploration. The discovery of new reserves is becoming more and more difficult. The current exploration results showed that 90.0% of the oil and gas of the Bozhong sub-basin is from the source rocks of the third member (Es3) and the first member (Es1) of the Shahejie Formation (internal data of CNOOC). Previous studies on the source rocks of Es3 have been reported (Yang and Li 2012), but the overall research is still rare, and mor
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