Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (1): 1-12.doi: 10.13278/j.cnki.jjuese.201501101

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Petroleum Geological Conditions and Exploration Prospect of the Mesozoic in Southeast China Sea Area

Yang Changqing, Li Gang, Gong Jianming, Yang Chuansheng   

  1. Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources/Qingdao Institute of Marine Geology, Qingdao 266071, Shangdong, China
  • Received:2014-05-01 Online:2015-01-26 Published:2015-01-26

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Abstract:

Southeast China Sea area is located in the southeast margin of the Eurasian plate, surrounded by the Pacific plate and Indian plate in the Mesozoic stage. The petroleum explorations in the past are more concentrated on the Tertiary in this area. Based on previous studies, We propose the Mesozoic is a noteworthy exploration through the analysis of petroleum geological conditions in the Southeast China Sea and its periphery. The results of our studies have shown that the Mesozoic strata widely distributes in Southeast China Sea. The distributions of Mesozoic in the southern East China Sea, the Taiwan Island and the southwest Taiwan basin were related to Okinawa suture zone and the Philippines Palawan suture zone, and there were deep sea facies siliceous sedimentation, and the distributions of Mesozoic in the northern South China Sea and the adjacent land areas, especially the marine strata were related to the early Ailao Mountain-Red River Indosinian suture zone, and there were the Upper Triassic-Lower Jurassic marine facies and marine-terrigenous facies clastic rocks and Late Jurassic-Cretaceous continental clastic sediments.It can be inferred from the drilling data and land geology that there are two sets of good hydrocarbon source rocks developed and stronger hydrocarbon generating potential in the Southeast China Sea. A series of hydrocarbon source rock is the Upper Triassic-Lower Jurassic marine mud shale, with organic carbon contents between 0.28%-14.96%, the main types of kerogen type dominatedⅡ2 and Ⅲ, and another is the Lower Cretaceous marine mud-shale, with organic carbon content between 0.60%-2.00%, kerogen type Ⅲ, partial type Ⅱ2. And there are two sets of source-reservoir-caprock assemblages. One is composed of the Upper Triassic-Lower Jurassic Marine mud-shale and Lower Cretaceous marine mud-shale as hydrocarbon source rocks, the Middle-Upper Jurassic sandstone as reservoir, together with the Early Cretaceous mud shale as caprock. Another is composed of the Early Cretaceous mud shale as hydrocarbon source rocks, and the Cretaceous sandstone as reservoir, the Upper Cretaceous or later mud-shale as caprocks. It is worth exploring plays formed by combining with the "lower source-upper reservoir" and "self source-self reservoir".

Key words: basin evolution, petroleum geological condition, exploration prospect, hydrocarbon source rocks, Mesozoic, Southeast China Sea area

CLC Number: 

  • P618.13

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