辽中凹陷中南部西斜坡东三段湖底扇沉积特征与发育模式

王启明; 杜晓峰; 官大勇; 张宏国; 付鑫

doi:10.3799/dqkx.2023.020

Volume 48 Issue 8

Aug. 2023

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Wang Qiming, Du Xiaofeng, Guan Dayong, Zhang Hongguo, Fu Xin, 2023. Sedimentary Characteristics and Development Pattern of Sublacustrine Fan in the Third Member of Dongying Formation in the South-Central Western Slope of Liaozhong Sag. Earth Science, 48(8): 2979-2992. doi: 10.3799/dqkx.2023.020

Citation:

Wang Qiming, Du Xiaofeng, Guan Dayong, Zhang Hongguo, Fu Xin, 2023. Sedimentary Characteristics and Development Pattern of Sublacustrine Fan in the Third Member of Dongying Formation in the South-Central Western Slope of Liaozhong Sag. Earth Science, 48(8): 2979-2992. doi: 10.3799/dqkx.2023.020

Citation:

Wang Qiming, Du Xiaofeng, Guan Dayong, Zhang Hongguo, Fu Xin, 2023. Sedimentary Characteristics and Development Pattern of Sublacustrine Fan in the Third Member of Dongying Formation in the South-Central Western Slope of Liaozhong Sag. Earth Science, 48(8): 2979-2992. doi: 10.3799/dqkx.2023.020

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Sedimentary Characteristics and Development Pattern of Sublacustrine Fan in the Third Member of Dongying Formation in the South-Central Western Slope of Liaozhong Sag

doi: 10.3799/dqkx.2023.020

Tianjin Branch of CNOOC Ltd., Tianjin 300452, China

Received Date: 2023-01-03
Publish Date: 2023-08-25

Abstract

Abstract

In order to clarify the genetic types, controlling factors and distribution rules of sandbodies in the third member of Dongying Formation of the west slope in the south-central Liaozhong Sag, combining drilling logs, analytical tests and 3D seismic data, the characteristics of sandbodies sedimentary response were analyzed, and its controlling factors and development patterns were discussed, the plane distribution and vertical evolution characteristics of gravity flow under high-precision sequence framework were clarified by means of well seismic calibration, stratum slicing and attribute extraction. The results show that the sandbodies in the third member of Dongying Formation of the study area were sublacustrine fan deposits, which have unique sedimentary characteristics of gravity flow on the grain size curve and C-M map. The sedimentary structure was dominated by massive sandstone, with local gravity flow characteristics such as boulders, mudstone lacerations, corrugated bedding and parallel bedding. There are two kinds of seismic phase characteristics: strong amplitude reflection of a single in-phase axis, low frequency of medium and weak amplitude, and certain configuration. The sublacustrine fan sandbodies were mainly controlled by the source supply outside the basin, the slope break zone and the secondary lake flood surface. Among them, The large braided river delta formed from the source outside the western Yanshan, which crossed the Liaoxi low uplift of "chain island" type, provided the material basis for sublacustrine fan deposition. the development location and facies zone boundary of sublacustrine fan were controled by the sedimentary slope breaks. The forward and reverse fault slope breaks in the basin can redistribute and regulate the distribution and flow direction of sand bodies, and further control the plane distribution morphology and development degree of sublacustrine fan sandbodies. The secondary flood surface formed by the frequent fluctuation of the lake plane controlled the vertical multi-phase superposition of sublacustrine fan, and the flood mudstone provided a good preservation condition for the lateral occlusion of the slope zone. The three-factor dynamic equilibrium sublacustrine fan sedimentation model controled the development of large-area lithologic traps in the slope area. sublacustrine fan are mainly distributed in the trangressive system tract of in the third member of Dongying sequence, a small amount of sublacustrine fan are developed in the lowstand system tract and highstand system tract. In the plane, the sublacustrine fan in the B structure area is tongue like, and its development scale and distribution range are better than those in the A and C structure areas, and the vertical overlap is good, and the oil and gas accumulation conditions are superior, which is a favorable target for the next exploration and evaluation of lithologic reservoirs.
- sublacustrine fan,
- sedimentary characteristics,
- evolutionary characteristics,
- developmental pattern,
- slope zone,
- lithologic trap,
- the third member of Dongying Formation,
- LiaoZhong sag,
- petroleum geology

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References(53)

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Sedimentary Characteristics and Development Pattern of Sublacustrine Fan in the Third Member of Dongying Formation in the South-Central Western Slope of Liaozhong Sag

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