东海陆架盆地西湖凹陷中央反转构造带古近系花港组气藏“先汇后聚”机制及地质意义

doi:10.11743/ogg20230514

Abstract

Abstract:

Inverted structural zones in many onshore basins around the world are frequently found to be home to oil and gas traps and have been the targets for studies for years. However， offshore inverted structural zones， in the contrary， are seldom explored because of less drilling due to high cost. Taking the central inverted structural zone of Xihu Depression as an example， this paper focuses on the original capacity of hydrocarbon convergence in the source rock series and the dynamic accumulation of hydrocarbons from source to reservoir， with the aim of revealing the hydrocarbon enrichment law. The correlation of structural evolution， hydrocarbon generation and reservoir evolution as well as hydrocarbon charging history reveals that the massive hydrocarbon generation and charging of source rocks preceded the formation of traps in the northern part of the zone. The early-generated gas formed “semi accumulation” with high abundance within the series， i.e.， “convergence first”； and then migrated upwards and accumulated in traps formed later during tectonic movements， i.e.， “later accumulation”. The reservoirs show a trend of increasing natural gas maturity from deep to shallow. Based on these results， the paper proposes the new model of “convergence ahead of accumulation”， which not only reasonably explains the mismatch of timing among the hydrocarbon generation， trap formation and hydrocarbon charging in the Huagang Formation in the series， but also reveals the control effect of ancient tectonic background on the current accumulation of oil and gas. Under the guidance of this model， the key factors for the formation of large-scale natural gas reservoirs in the zone are revealed， and the B structure in the zone is pinpointed to be a perfect place for “convergence ahead of accumulation”. The new model can be applied to other offshore petroliferous basins with similar geological conditions.

Key words: convergence ahead of accumulation, accumulation mechanism, dynamic accumulation process, gas reservoirs, Huagang Formation, Xihu Depression, East China Sea Shelf Basin

CLC Number:

TE122.3

Yingzhao ZHANG, Wei ZOU, Zhongyun CHEN, Yiming JIANG, Hui DIAO. The mechanism of “convergence ahead of accumulation” and its geological significance for gas reservoirs in Paleogene Huagang Formation across the central inverted structural zone of Xihu Depression， East China Sea Shelf Basin[J]. Oil & Gas Geology, 2023, 44(5): 1256-1269.

Figures/Tables 11

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井号	深度/m	层位	测试方法	δ¹³C/‰			甲烷碳同位素计算R_o/%
井号	深度/m	层位	测试方法	C₁	C₂	C₃	甲烷碳同位素计算R_o/%
D1	4 298.00	H6砂组	包裹体击碎	-43.8	—	—	1.02
A4	4 333.90	H3砂组	包裹体击碎	-30.6	—	—	1.72
C1	3 188.00	H2砂组	天然气	-30.8	-25.2	-23.5	1.70
C1	3 724.00	H3砂组	天然气	-31.5	-27.5	-26.0	1.66
C2	4 296.38	H5砂组	天然气	-32.2	-26.6	-23.8	1.61
A2	4 585.00	H5砂组	天然气	-32.1	-24.1	-22.7	1.62
A3	4 571.58	H5砂组	天然气	-31.4	-25.0	-23.2	1.66

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The mechanism of “convergence ahead of accumulation” and its geological significance for gas reservoirs in Paleogene Huagang Formation across the central inverted structural zone of Xihu Depression， East China Sea Shelf Basin

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