Petroleum Exploration and Development >

0 20231012 - 20231012

DOI: https://doi.org/10.11698/PED.20220403

Genetic mechanisms and exploration targets of high-quality Permian clastic rock reservoirs in Bohai Bay Basin, East China

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  • 1. National Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China;
    2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;
    3. PetroChina Dagang Oilfield Company, Tianjin 300280, China;
    4. Sinopec Shengli Oilfield Company, Dongying 257001, China

Received date: 2022-06-09

  Revised date: 2023-08-16

  Online published: 2023-08-21

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Abstract

Based on core observation, thin section examination, fluid inclusions analysis, carbon and oxygen isotope analysis, and other approaches, the structural and burial evolution histories were investigated, and the diagenetic evolution process and genetic/development models were systematically discussed of the Upper Paleozoic Permian clastic rock reservoirs in the Bohai Bay Basin. The Bohai Bay Basin underwent three stages of burial and two stages of uplifting in the Upper Paleozoic. Consequently, three stages of acidic fluid (oil and gas) leaching, generated by the thermal evolution of kerogen, and two stages of meteoric freshwater leaching occurred. Dissolution in deeply buried, nearly closed diagenetic system was associated with the precipitation of authigenic clay and quartz, leading to a limited increase in storage space. Different structural uplifting-subsidence processes of tectonic zones resulted in varying genetic-reservoir-forming processes of the Permian clastic reservoirs. Three genetic models of reservoirs are recognized. Model I reservoirs with pores formed in shallow strata and buried in shallow to medium strata underwent two phases of exposure to long-term open environment and two phases of meteoric freshwater leaching to enhance pores near the surface, and were shallowly buried in the late stage, exhibiting the dominance of secondary pores and the best physical properties. Model II reservoirs with pores formed in shallow strata and preserved due to modification after deep burial experienced an early exposure-open to late burial-closed environment, where pore types were modified due to dissolution, exhibiting the dominance of numerous secondary solution pores in feldspar and the physical properties inferior to Model I. Model III reservoirs with pores formed after being regulated after multiple periods of burial and dissolution experienced a dissolution of acidic fluids of organic origin under a near-closed to closed environment, exhibiting the dominance of intercrystalline micropores in kaolinite and the poorest physical properties. The target reservoirs lied in the waterflood area in the geological period of meteoric freshwater leaching, and are now the Model II deep reservoirs in the slope zone-depression zone. They are determined as favorable options for subsequent exploration.

Key words： Bohai Bay Basin; Permian; clastic rock; diagenetic evolution; reservoir-forming mechanism; secondary pore

Cite this article

CAO Yingchang, SUN Peipei, ZHOU Lihong, YUAN Guanghui, LIU Huimin, LOU Da, WU Zhiping, JIN Qiang, JIANG Youlu . Genetic mechanisms and exploration targets of high-quality Permian clastic rock reservoirs in Bohai Bay Basin, East China[J]. Petroleum Exploration and Development, 0 : 20231012 -20231012 . DOI: 10.11698/PED.20220403

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