Reservoir architecture pattern analysis of distal shallow water braided delta front: A case study of L18 fault block, Liuxi Oilfield,Raoyang sag,Jizhong Depression
Zhou Lin1, Lü Chuan-Bing2, Ji You-Liang1, Lin Tie-Lin3, Ran Ai-Hua2, Lu Yi-Lun1, Liu Tian-Yi1, Xie Lin-Lin4, Wei Wei4
1 State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China; 2 Huabei Oilfield Company,PetroChina,Hebei Renqiu 062552,China; 3 Development Business Department, PetroChina Huabei Oilfield Company, Hebei Renqiu 062552, China; 4 No.3 Oil Recovery Plant of PetroChina Huabei Oilfield,Heibei Hejian 062450,China
Abstract Core, well logging, 3D seismic data and production dynamic data of L18 fault block in Liuxi Oilfield, Raoyang sag, Jizhong Depression, were used to analyze the facies of distal shallow water braided delta front and architecture pattern of sand body and to establish a refined sedimentary architecture model of distal shallow water braided delta front. The research shows that: (1) The water was at a low level in study area and the delta front was widely developed. The delta front is divided into the proximal, middle and distal belts. Each facies belt varied in thickness, lithology combination and the lateral connectivity of the sand body; (2) The distributary channel in the distal belts was formed under weak hydrodynamics and limited sediment supply, which resulted in a small-scale mouth bar with poor lateral connectivity, and the thick muddy layers deposited between the bars formed the main type of interlayer.(3) The hydrodynamic strength of the distributary channel in the middle belt is moderate, forming bead-like or bifurcated mouth bars. A single mouth bar is composed of 2~4 accretion sand bodies with a dip angle of~2.2°. The muddy layer sdeposited between the accretion sand bodies is the main type of interlayer; (4) Controlled by the strong hydrodynamics, sufficient sediment supply and strong incision effect, the mouth bar stacked with each to form a continuously distributed mouth bar complex. The single mouth bar is composed of multiple accretion sand bodies with a high dip angle of 3.5°. The overflow muds and muddy deposited between accretion sand bodies are the two main types of interlayer developed in the mouth bar.
Fund:Financially supported by the National Natural Science Foundation of China(No.41672098)
Corresponding Authors:
Ji You-Liang,born in 1962,is a professor of China University of Petroleum(Beijing). He is mainly engaged in researches and teaching of petroleum geology,sedimentology and sequence stratigraphy. E-mail: jiyouliang@cup.edu.cn.
About author: Zhou Lin,born in 1995,is a master degree candidate of China University of Petroleum(Beijing). He majors in geological resources and geological engineering. E-mail: zhoulin103211@sina.com.
Cite this article:
. Reservoir architecture pattern analysis of distal shallow water braided delta front: A case study of L18 fault block, Liuxi Oilfield,Raoyang sag,Jizhong Depression[J]. JOPC, 2019, 21(6): 959-970.
. Reservoir architecture pattern analysis of distal shallow water braided delta front: A case study of L18 fault block, Liuxi Oilfield,Raoyang sag,Jizhong Depression[J]. JOPC, 2019, 21(6): 959-970.
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