Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (1): 83-95.doi: 10.12108/yxyqc.20230108

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Diagenesis characteristics of tight sandstone reservoirs with high temperature,overpressure and high CO2 content: A case study of Neogene Meishan-Huangliu Formation in LD10 area,Yinggehai Basin

YANG Kaile1,2, HE Shenglin1,2, YANG Zhaoqiang1,2, WANG Meng1,2, ZHANG Ruixue3, REN Shuangpo4,5, ZHAO Xiaobo4,5, YAO Guangqing4,5   

  1. 1. Zhanjiang Branch of CNOOC (China) Co., Ltd., Zhanjiang 524057, Guangdong, China;
    2. Hainan Branch of CNOOC (China) Co., Ltd., Haikou 570311, China;
    3. Jianghan Oil Production Plant, Sinopec Jianghan Oilfield Company, Qianjiang 433124, Hubei, China;
    4. Key Laboratory of Tectonics and Petroleum Resource, Ministry of Education, China University of Geosciences (Wuhan)， Wuhan 430074, China;
    5. School of Earth Resources, China University of Geosciences (Wuhan)， Wuhan 430074, China
  • Received:2021-10-25 Revised:2022-04-15 Online:2023-01-01 Published:2023-01-06

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Abstract: By means of thin section identification，scanning electron microscopy，cathodoluminescence，and carbon and oxygen isotope analysis，the diagenesis characteristics and their influence on pores of Neogene MeishanHuangliu Formation under the background of high temperature，overpressure and high CO2 content in LD10 area of Yinggehai Basin were studied. The results show that: (1) The reservoirs of Neogene Meishan-Huangliu Formation in LD10 area of Yinggehai Basin are developed with gravity flow. The lithologies are mainly medium-fine feldspathic lithic quartz sandstones，and the reservoir physical properties are mainly characterized by ultra-low porosity and ultra-low permeability. (2) Compaction，cementation and dissolution are the main diagenesis types in the study area. Overpressure can obviously inhibit the transformation of clay minerals and the secondary enlargement of quartz，which can protect the primary pores to a certain extent. The high-temperature fluid rich in CO2 not only causes the abnormal transformation of clay minerals，but also promotes the dissolution to increase the secondary pores. (3) The diagenetic sequence of the second member of Huangliu Formation is summarized as siderite cementation→secondary enlargement of quartz→chlorite cementation→early stage feldspar dissolution→ kaolinite formation→early stage calcite cementation→early stage dolomite cementation→feldspar dissolution→ calcite dissolution→massive illite formation→late stage iron calcite and iron dolomite formation. (4) In general， compaction reduces the porosity by 45.30%-62.93%，and cementation reduces the porosity by 1.65%-35.01%， while dissolution increases the porosity by 0.72%-8.00%. The sandstone reservoir in the middle and lower part of Huangliu Formation is affected by overpressure and CO2 dissolution，with good physical properties，so high CO2 risk should be considered during drilling.

Key words: tight sandstone reservoir, high temperature-overpressure-high CO2 content, diagenetic evolution, Meishan-Huangliu Formation, Neogene, LD10 area, Yinggehai Basin

CLC Number: 

  • TE121.1
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