Oil & Gas Geology ›› 2022, Vol. 43 ›› Issue (3): 499-513.doi: 10.11743/ogg20220302

• Petroleum Geology • Previous Articles     Next Articles

Research of “synthem units of exploration” in mature exploration area and its application in the Dongying Sag, Bohai Bay Basin

Mingshui Song1(), Yongshi Wang2, Xuejun Wang2, Xuefeng Hao2, Youqiang Li2, Dongxia Chen3, Fuwei Wang3, Qiaochu Wang3, Xuebin Shi3, Yi Zou3   

  1. 1.SINOPEC Geophysics Co. ,Ltd. ,Beijing 100020,China
    2.Research Institute of Exploration and Development of Shengli Oilfield Branch Company,SINOPEC,Dongying,Shandong 257015,China
    3.State Key laboratory of Petroleum Resources and Prospecting,China University of Petroleum (Beijing),Beijing 102249,China
  • Received:2021-07-14 Revised:2022-03-20 Online:2022-06-01 Published:2022-05-06

Abstract:

The explored areas in eastern China have reached high exploration maturity as a whole. Selecting evaluation units suitable for fine exploration in these areas is of great significance to reducing exploration risks and achieving efficient exploration. As a hydrocarbon accumulation-geological evaluation method suitable for current geological understanding and fine exploration, research of “synthem units of exploration” mainly includes the definition and division of synthem units of exploration, the evaluation of remaining resource potential, the analysis of oil and gas accumulation patterns and accumulation modes, the selection and classification evaluation, and related exploration deployment. The concept of synthem unit of exploration inheriting the thought of system theory, is an extension and development of sedimentary facies-control theory and structural zone-control theory in hydrocarbon play study. It puts forward a comprehensive research system integrating petroleum system, play and oil and gas reservoir, featuring research methodology embodying the unity of the whole and individual, the unity of systematization and heterogeneity, the unity of systematic research and fine characterization, and the unity of predictability and effectiveness. According to the concept, the 193 synthem units of exploration are recognized in 9 exploration target zones in Dongying Sag and classified into 20 types, comprehensively considering the differences and similarities of reservoir-forming processes and characteristics. Thereby, fine, multi-dimensional geological understanding and exploration deployment have been achieved. Fine assessment of the remaining resource potentials and benefit evaluation of exploration targets are carried out based on the concept of exploration structural-layer unit, making it clear that there are 22 optimal exploration structural-layer units in 4 domains of interest in Dongying Sag, including the upper fourth member of Shahejie Formation-Dongying Formation of the Paleogene, the Neogene Guantao Formation-Minghuazhen Formation, the Paleozoic buried hill, and the Paleogene Kongdian Formation-the lower fourth member of Shahejie Formation. These are important targets for reserve growth and exploration breakthrough in the near and medium term, serving as a basis for efficient exploration.

Key words: resource potential, hydrocarbon accumulation mode, synthem unit of exploration, mature exploration area, faulted basin, residual oil and gas resources, Dongying Sag, Bohai Bay Basin

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