泌阳凹陷东南部核桃园组近岸水下扇与扇三角洲沉积特征比较及控制因素分析

doi:10.11743/ogg20150212

Abstract

Abstract:

Coarse-grained clastic deposits are widely developed in the Hetaoyuan Formation of the steep slope belt in southern Biyang Sag of Nanxiang Basin.They together with nose-like structures in the sag form many high-quality oil and gas reservoirs.However,the genesis of these deposits is still uncertain.The bone of contention is whether they are fan delta genesis or nearshore subaqueous fan genesis.To answer the question and get a better look at how they are distributed horizontally,we compared and summarized the two geneses and discussed their controlling factors in a stratigraphic sequence framework and from the following 6 perspectives of sedimentary settings,subfacies and microfacies categorization,drilling and logging data,core analyses,grain size distribution features and seismic response characteristics.The results show that the steepness difference of faults caused by large boundary faulting activities controlled their genesis.Horizontally,fan deltas are developed in the west area with gentle faults(55°-75°)while nearshore subaqueous fans are deve-loped in the east area with steep faults(75°-90°)nearshore. Seismic profiles also show that early faults are steeper and favorable for the deposition of nearshore subaqueous fans;while later faults are more gentle and good for fan delta to be formed.

Key words: nearshore subaqueous fan, fan delta, glutenite body, structural control, Hetaoyuan Formation, Biyang Sag, Nanxiang Basin

CLC Number:

TE121.3

Dong Yanlei, Zhu Xiaomin, Geng Xiaojie, Wang Bo, Wang Heng, Jiang Qiang, Guo Lei, Wei Minpeng. Sedimentary characteristics comparison and controlling factors analyses of nearshore subaqueous fan and fan delta in the Hetaoyuan Formation of southeastern Biyang Sag[J]. Oil & Gas Geology, 2015, 36(2): 271-279.

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Sedimentary characteristics comparison and controlling factors analyses of nearshore subaqueous fan and fan delta in the Hetaoyuan Formation of southeastern Biyang Sag

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