Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (1): 96-105.doi: 10.12108/yxyqc.20190111

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Key sequence surfaces identification and its significance in the exploration of lithologic reservoirs: a case of Zhujiang Formation in Huizhou Depression

RUI Zhifeng1, LIN Changsong1, DU Jiayuan2, DING Lin2, LI Xiao2   

  1. 1. School of Energy Resources, China University of Geosciences, Beijing 100083, China;
    2. Shenzhen Branch, CNOOC, Shenzhen 518000, Guangdong, China
  • Received:2018-05-07 Revised:2018-07-18 Online:2019-01-18 Published:2019-01-18

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Abstract: Sandbody updip pinch-out reservoir is an important target for subtle traps exploration,among which sandbody updip pinch-out trap formed in delta front sandbodies is one of the most important types. In the third-order sequences mainly constituted by delta front sediments,the identification of high-resolution sequence stratigraphic interfaces and the analysis of sequence composition play key roles in understanding the distribution of sandbody updip pinch-out reservoirs and their hydrocarbon exploration. A high-frequency sequence stratigraphic framework consisting of fourth-order sequence was established for Zhujiang Formation in Huizhou area,the Pearl River Mouth Basin. The high-frequency sequence surfaces include two types,which are sedimentary transition surface and secondary flooding surface. The compositional characteristics of the fourth-order sequence are different in different system tracts of the third-order sequence. The fourth-order sequence developed in the transgression system tract consists of complete progradation and retrogradation cycle,while the fourth-order sequence developed in the highstand system tract mostly consists of progradation half-cycle. The formation and distribution of the sandbodies are controlled by the third-order sequence surface and the fourth-order sequence transition surface, and the formation and distribution of the mud layer are controlled by the maximum water flooding surface and the sub-level water flooding surface. The typical "sandwich" structure is composed of top layer,reservoir and floor layer,which overlap vertically. It forms multiple sets of reservoir-seal assemblage for sandbody updip pinch-out cap oil and gas exploration,also controls the planar distribution of lithologic reservoirs.

Key words: high-resolution sequence stratigraphic framework, key surfaces, sand control and reservoir control, roof and floor control, Zhujiang Formation, Huizhou Depression

CLC Number: 

  • TE121.3+4
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