Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (6): 32-46.doi: 10.12108/yxyqc.20220603

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Sequence stratigraphic characteristics and favorable reservoirs distribution of Permian Qixia Stage in Weiyuan-Gaoshiti area， Sichuan Basin

LI Ling1,2,3, ZHANG Zhaokun1,2, LI Minglong1,2,3, NI Jia4, GENG Chao4, TANG Sizhe1,2, YANG Wenjie1,2, TAN Xiucheng1,2,3   

  1. 1. Southwest Petroleum University Division of CNPC Key Laboratory of Carbonate Reservoirs, Chengdu 610500, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu 610500, China;
    3. Sichuan Key Laboratory of Natural Gas Geology, Southwest Petroleum University, Chengdu 610500, China;
    4. Southern Sichuan Gas field, PetroChina Southwest Oil and Gas Field Company, Luzhou 646000, Sichuan, China
  • Received:2022-02-22 Revised:2022-04-25 Online:2022-11-01 Published:2022-11-09

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Abstract: Based on cores，cuttings and logging data，the sequence stratigraphic characteristics of Permian Qixia Stage in Weiyuan-Gaoshiti area of Sichuan Basin were comprehensively analyzed， and favorable reservoir distribution and controlling factors were pointed out. The results show that： （1）Two type Ⅰ sequence boundaries （bottom boundary of Liangshan Formation and top boundary of Qixia Formation）and two type Ⅱ sequence boundaries（top boundary of Qi 1 member and top boundary of Qi 2b member）were identified in Permian Qixia Stage in Weiyuan-Gaoshiti area. Accordingly， the Qixia Stage was divided into SQ1， SQ2 and SQ3，corresponding to Liangshan Formation and Qi 1 member，Qi 2b member and Qi 2a member，respectively.（2）The sequence filling framework and sequence plane distribution characteristics of Qixia Stage show that the bottom stratum （SQ1）has the characteristics of onlapping to the pre-depositional palaeogeomorphology highland， and the middle and upper strata（SQ2 and SQ3）continuously migrate from the sedimentary geomorphic highland to the lowland， showing the sequence filling pattern of onlapping at the bottom and migration at the middle-upper.（3）During the sedimentary period of SQ2 and SQ3 highstand systems tracts in the study area，mound-shoal complexes with large thickness and good lateral continuity were developed in the paleogeomorphology highlands and slope breaks， which laid material foundation for reservoir development. During that period，the sea level was in high-frequency change. The mound-shoal complexes high-frequency exposure karstification，improving the reservoir properties， and the pressure-soluble skeleton formed after the early dolomitization， which is beneficial to the development of the reservoir.（4）The development and distribution of thin dolomite reservoirs are controlled by sedimentary facies and karstification. The highlands and slope breaks in Qixia Stage are potential areas for next exploration.

Key words: sequence stratigraphy, palaeogeomorphology highland, slope break, sedimentary facies control, karstification, thin dolomite reservoir, Qixia Stage, Permian, Weiyuan-Gaoshiti area, Sichuan Basin

CLC Number: 

  • TE121.3+4
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[8] QI Minghui，LU Zhengyuan，YUAN Shuai，LI Xinhua. The analysis on the sources of water body and characteristic of water breakthough at Block 12 in Tahe Oilfield[J]. Lithologic Reservoirs, 2009, 21(4): 115 -119 .
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[10] LIU Yun，LU Yuan，YI Xiangyi， ZHANG Junliang， ZHANG Jinliang，WANG Zhenxi. Gas hydrate forecasting model and its influencing factors[J]. Lithologic Reservoirs, 2010, 22(3): 124 -127 .
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