鄂尔多斯盆地庆阳气田二叠系山西组1段层序结构与沉积演化及其控制因素

doi:10.11743/ogg20220610

Abstract

Abstract:

The Qingyang gas field in the Ordos Basin is the most promising for reserve growth and production addition， with the first member of Permian Shanxi Formation （Shan-1） being the main pay zone. However， a lack of understanding to the sedimentary evolution and controlling factors of the member hinders further exploration and development of the field. A systematic study was then carried out on the development and evolution of sedimentary sequences of the member as well as its response to palaeogeomorphology， paleocurrent and lake level changes based on analyses of 3D seismic， logging， core and test data through logging wavelet transform， INPEFA and Fischer plots. The results show that the member contains a third-order sequence of a full transgressive-regressive cycle. The sequence can be further divided into the low stand， transgressive and high stand system tracts. Depositional systems are recognized to be shallow-water deltas and lacustrine systems. Fischer plots reveal that the lacustrine level change during deposition of the member experienced a rapid transgression to a slow regression， accompanied by the secondary lake-level fluctuation. The stacking succession recording PA （progradation to accretion） to R （retrogradation） then to AP （accretion to progradation） corresponds to the migration and evolution of sedimentary facies and the changes in accommodation space. The delta sandstone reservoirs， widely developed in ancient landform slope area during the low stand system tracts， are considered the potential targets for exploration and development of gas in the field.

Key words: lake level fluctuation, sequence architecture, sedimentary evolution, Shanxi Formation, Qingyang gas field, Ordos Basin

CLC Number:

TE122.1

Hui Xia, Long Wang, Daofeng Zhang, Jiping Wang, Qianqian Fan, Min Feng, Yan Wang. Sequence architecture， sedimentary evolution and controlling factors of the Permian Shan-1 Member， Qingyang gas field， southwestern Ordos Basin[J]. Oil & Gas Geology, 2022, 43(6): 1397-1412.

Figures/Tables 15

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岩相组合	沉积特征	沉积相解释
FA1	厚层块状层理、板状交错层理及平行层理粗砂岩：底部见明显冲刷面，含石英砾岩，大套厚层块状粗砂岩向上粒度变细，板状交错层理、平行层理较发育，顶部为块状中砂岩	分流河道
FA2	中-薄层块状灰色泥岩：块状层理、水平层理泥岩或炭质泥岩，偶见泥裂构造	泛滥平原
FA3	厚层块状层理、平行层理、交错层理中-细砂岩：底部多见明显的冲刷面，含暗色泥砾，发育块状层理、槽状交错层理、板状交错层理、楔状交错层理、平行层理，底部为中-细砂岩，向上岩性变为细砂岩或粉砂岩	水下分流河道
FA4	中-薄层灰色块状层理泥岩或粉砂质泥岩：夹在大套的块状层理、平行层理、楔状交错层理及板状交错层理砂岩中间	分流间湾
FA5	中层平行层理、波状层理及楔状交错层理细-粗砂岩：呈反粒序，底部细粒泥质粉砂岩或粉砂岩向上粒度变粗，上部为粗砂岩	河口坝
FA6	中-薄层平行层理、脉状层理、沙纹层理及平行层理粉砂岩：反粒序，由粉砂岩向上变为粗砂岩，发育平行层理、脉状层理及沙纹层理	坝砂
FA7	薄层块状层理、平行层理细砂岩：薄层细砂岩，发育平行层理及块状层理	滩砂
FA8	厚层块状灰色或灰黑色泥岩：泥岩或粉砂质泥岩，以块状层理为主	浅湖泥

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Sequence architecture， sedimentary evolution and controlling factors of the Permian Shan-1 Member， Qingyang gas field， southwestern Ordos Basin

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