Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (1): 145-156.doi: 10.12108/yxyqc.20240114

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Sequence stratigraphy and evolution of Triassic Chang 7 to Chang 3 mebers in Qingcheng area，southwestern Ordos Basin

LONG Shengfang1,2, HOU Yunchao1,2, YANG Chao1,2, GUO Yixuan1,2, ZHANG Jie1,2, ZENG Yali1,2, GAO Nan1,2, LI Shanghong3   

  1. 1. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    2. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil and Gas Fields, Xi'an 710018, China;
    3. Oil and Gas Cooperative Development Branch, CNPC Bohai Drilling Engineering Co., Ltd., Tianjin 300457, China
  • Received:2022-12-08 Revised:2023-02-05 Online:2024-01-01 Published:2024-01-02

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Abstract: The methods such as fine calibration of well-seismic fine calibration, constraint of tuff marker layer and forward modeling of velocity were used to establish isochronous stratigraphic framework of Chang 7 to Chang 3 members of Triassic Yanchang Formation in Qingcheng area, southern Ordos Basin, and the stratigraphic evolution characteristics were analyzed. The results show that:(1) The lake flooding mudstone of Triassic Chang 7-Chang 3 members in Qingcheng area is characterized by high gamma ray, high acoustic wave and medium to high resistivity. The individual lake flooding mudstone layer is horizontally inclined to the center of the lake basin, which can extend from the traditional members of Chang 3 to Chang 7, with isochronal correlation significance. The fine-grained sediments developed in Chang 4+5 member are the superimposed response result of lake flooding in different periods. (2) The Chang 7 to Chang 3 members in study area is bounded by lake flooding mudstone, and can be divided into seven isochronous stratigraphic units(Pss1-Pss7) from bottom to top, which are superim-posed on each other horizontally and flow towards the center of the lake basin, and are vertically manifested as the "ternary" structure of top set, oblique set and bottom set.(3) In the study area, Chang 7-Chang 3 members are generally characterized by progradation filling under the background of shock lake regression, and its evolution can be divided into three stages. The first stage(Pss1-Pss2) is in the early filling stage, with relatively gentle slope, and the strata are generally in the form of wedge aggradation-weak progradation superposition. In the middle stage(Pss3-Pss5), with the progradation slope advancing to the semi-deep lake-deep lake area, the slope became larger, and the strata were mainly characterized by "S" type progradation structure, with delta front deposits widely developed in the top set, and gravity flow sand bodies of deep lake facies developed in the bottom set. In the late stage(Pss6-Pss7), the lake basin shrank, the water body became shallower, the slope height and angle became smaller, the top set developed delta plain facies deposits, the middle and upper part of the oblique set was mainly delta front deposits, and the middle and lower part of the oblique set and the front part of the bottom set were mainly delta-semi-deep lake facies muddy deposits.

Key words: stratigraphic evolution, foreset slope, flooding surface, tuff marker, forward modeling, Yanchang Formation, Triassic, Qingcheng area, Ordos Basin

CLC Number: 

  • TE122.2
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