东海盆地西湖凹陷平北斜坡带平湖组煤系原油地球化学特征与油-源精细对比

doi:10.11743/ogg20220215

Abstract

Abstract:

The properties and distribution of crude oil from the coal measure source rocks are complex in Pingbei slope belt of Xihu Sag， East China Sea Shelf Basin. In addition， the sedimentary environment and organic matter origin of coal measure source rocks are highly variable in both vertical and horizontal views. The oil reservoirs in this area are characterized by hydrocarbon supply from multiple sources including western subsag and the slope zone. A combination of geological and geochemical analyses is applied to study crude oil types and fine oil-source correlation. Finally， the relationship between crude oil distribution and hydrocarbon-generating subsag is clarified. The results show that the crude oil in Pingbei area is mainly condensate oil， accompanied by a small amount of light and normal crude oil， and it can be grouped into three types （i.e. TypeⅠ，Ⅱ₁ andⅡ₂） based on biomarker compound features. TypeⅠcrude oil mainly sourced from coniferales resinites of gymnosperms of terrestrial higher plants， is mainly distributed in Kongqueting area， and is obviously related to the source rocks in the lower member and lower submember of middle member of Pinghu Formation in the western subsag. TypeⅡ₁ crude oil mainly occurs in the upper member and upper submember of middle member of Pinghu Formation in Wuyunting area and the NB8 subsag. It is speculated that both terrestrial gymnosperms and ferns， together with high-maturity marine organic matters from lower slope belt and western sabsag， have made contributions to the generation of TypeⅡ₁ crude oil， with the contribution of ferns even greater， and this type of crude oil is obviously related to the source rocks in the upper member and upper submember of middle member of Pinghu Formation. In addition， TypeⅡ₂ crude oil is mainly distributed in Wuyunting area and Baoyunting-Tuanjieting area， with greater contributions made by coniferales resinites of terrestrial gymnosperms； and it is obviously related to the source rocks in the lower member and lower submember of middle member of Pinghu Formation. The research results are of guiding value to the new understanding of oil source， reservoir prediction and hydrocarbon exploration in Pingbei slope belt.

Key words: geochemical characteristics, genetic type of crude oil, oil-source correlation, crude oil from coal measure source rock, Pinghu Formation, Pingbei slope belt, Xihu Sag, East China Sea Shelf Basin

CLC Number:

TE122.1

Tianjun Li, Zhilong Huang, Xiaobo Guo, Jing Zhao, Yiming Jiang, Sizhe Tan. Geochemical characteristics of crude oil from coal measure source rocks and fine oil-source correlation in the Pinghu Formation in Pingbei slope belt， Xihu Sag， East China Sea Shelf Basin[J]. Oil & Gas Geology, 2022, 43(2): 432-444.

Figures/Tables 11

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Table 1

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井位	顶深/m	底深/m	αααC₂₉甾烷20S/（20S+20R）	C₂₉甾烷αββ/（αββ+ααα）	Ts/Tm	MPI₁	MPI₁计算R_o/%
KQT-F	2 647.0	—	0.45	0.51	0.36	0.62	0.77
KQT-C	4 548.7	4 566.2	0.52	0.56	0.66	0.71	0.89
KQT-F	3 099.0	—	0.48	0.52	0.50	0.75	0.85
TJT-A	3 223.4	3 242.0	0.54	0.54	0.35	0.82	0.89
TJT-A	2 845.4	2 850.1	0.37	0.45	0.38	0.74	0.85
WTY-B	3 640.5	—	0.44	0.51	0.36	0.97	0.98
KQT-C	4 183.0	4 196.0	0.51	0.58	0.66	0.97	0.99
WYT-B	3 475.0	—	0.39	0.42	0.44	0.98	0.99
WYT-A	4 580.0	4 620.0	0.55	0.52	0.46	1.00	1.00
KQT-B	4 186.7	4 202.5	0.56	0.61	0.64	1.01	1.00
KQT-B	4 107.5	4 125.0	0.54	0.58	0.70	1.02	1.01
WYT-B	3 743.5	—	0.43	0.54	0.49	1.03	1.02
WYT-B	3 546.0	—	0.43	0.50	0.36	1.03	1.02
BYT-D	4 386.5	4 459.5	—	—	—	1.06	1.04
WYT-B	3 532.0	—	0.45	0.50	1.03	1.09	1.05
WYT-B	3 760.0	—	0.45	0.49	0.78	1.09	1.06
WYT-B	3 614.0	—	0.47	0.53	0.46	1.10	1.06
KQT-D	4 317.4	—	0.40	0.54	0.71	1.15	1.09
WYT-A	4 359.0	4 382.0	0.52	0.52	0.36	1.15	1.09
WYT-B	3 780.0	—	0.44	0.49	0.46	1.25	1.15
KQT-F	2 861.9	—	0.44	0.54	0.69	1.26	1.16

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Geochemical characteristics of crude oil from coal measure source rocks and fine oil-source correlation in the Pinghu Formation in Pingbei slope belt， Xihu Sag， East China Sea Shelf Basin

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