Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (5): 145-155.doi: 10.12108/yxyqc.20240514

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Characteristics of deep-water deposits and evolution law of Triassic Chang 7 reservoir in southeastern Ordos Basin

YIN Hu1,2, QU Hongjun1, SUN Xiaohan1, YANG Bo1, ZHANG Leigang1, ZHU Rongxing1   

  1. 1. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China;
    2. Fuxian Oil Production Plant, Yanchang Oilfield Co., Ltd., Fuxian 727500, Shaanxi, China
  • Received:2023-08-03 Revised:2024-03-20 Online:2024-09-01 Published:2024-09-04

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Abstract: Guided by the theory of sedimentology，the data of outcrops，drilling cores and logging were used to study the characteristics of deep-water deposits，including facies markers and sedimentary microfacies types，of Triassic Chang 7 reservoir in southeastern Ordos Basin，and the evolution law was revealed. The results show that：（1）Facies markers of deep-water deposits of Triassic Chang 7 reservoir in southeastern Ordos Basin include sedimentary structures such as horizontal bedding，Bouma sequence，trough mode，sliding and slump structure， tearing debris，mud-clad gravel，containing deep-water bivalves and fish fossils. The total suspended content in the grain size probability curve is large and the sorting is poor，and the features of zigzag，teethed box-bell-finger shaped and mudstone baseline can be seen on the logging curve.（2）The provenance of Chang 7 reservoir in the study area mainly comes from the northeast and south，with the development of deep to semi-deep lake，sublacustrine fan and shallow lake，and shallow lake sediment. The sublacustrine fan includes two types of gravity flow: turbidity flow and sandy debris flow. It can be further divided into microfacies such as gravity flow main channels，overflow deposits，gravity flow branch channels，inter branch channels，and lobes. The main channels of the sublacustrine fan mainly developed sandy debris flow deposits，while the branch channels and lobes are mainly developed turbidite deposits.（3）The sedimentary evolution law of Chang 7 reservoir in the study area is as follows: deep to semi-deep lake and sublacustrine fan deposits were developed in the central and southern parts of the study area，and shallow lake deposits were developed in the northeastern part. Four sublacustrine fans from the northeast direction were developed in the study area and two sublacustrine fans from the south were developed. The boundary between semi-deep lake and shallow lake extends along Yan’an-Ganquan belt from northwest direction. During the sedimentary period of Chang 73，the range of deep to semi-deep lake was the largest，and the sublacustrine fan was locally developed. During the sedimentary period of Chang 72 and Chang 71，the development of sublacustrine fan gradually increased，while the range of deep lake to semi-deep lake gradually lessened，showing an overall trend of interactive sedimentation between deep lake to semi-deep lake and lacustrine fans.

Key words: facies mark, deep water sedimentation, turbidity current, sandy debris flow, sublacustrine fan, Chang 7 reservoir, Triassic, southeastern Ordos Basin

CLC Number: 

  • TE121.3
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