Mechanisms for oil depletion and enrichment on the Shijiutuo uplift, Bohai Bay Basin, China

Hao, Fang; Zhou, Xinhuai; Zhu, Y.; Yang, Yuanyuan

doi:10.1306/04140908156

Cited by 85 publications

(47 citation statements)

References 59 publications

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“…The maximum rate in the center reached up to near 160 m/Ma and the minimum in the northern section was only 20 m/Ma, which was beneficial to oil and gas accumulation. The JX1-1 oil fi eld is just located at the zone with a low fault activity rate (Zhou, 2007;Hao et al, 2009a;2009b). …”

Section: Activity Rate At Different Strikes and Oil And Gas Migration Amentioning

confidence: 99%

Features of the fault system and its relationship with migration and accumulation of hydrocarbon in Liaodong Bay

Gong

et al. 2011

Pet. Sci.

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The fault system of Liaodong Bay developed extensively under the control of the Tanlu Fault.The fault system can be grouped into strike-slip faults of grade I, trunk faults of grade II and branch faults (induced faults) of grade III respectively based on its developmental scale. The faults of grade I and II were deep, early and large while the faults of grade III were shallow, late and small. The formation, evolution and distribution features played a signifi cant role in controlling the migration of oil and gas in both horizontal and vertical directions. The fl uid transfer in the fault system occurred in the process of faulting. The strike-slip and trunk faults moved actively forming predominant pathways for oil and gas migration. The branch faults, with weak activity, generally controlled the development of traps and were benefi cial for the accumulation and preservation of oil and gas. The faults of grade I and II formed the major migration pathways for oil and gas, but their fault activity rates appeared to vary along their strikes. The zones with a relatively low fault activity rate might be favorable for oil and gas accumulation. When the activities of strike-slip, trunk, and branch faults came to a halt, the fault seal behavior had a vitally important effect on the accumulation of oil and gas. The controlling role of the fault over fl uid distribution was further analyzed by calculating the fault activity quantitatively.

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Section: Activity Rate At Different Strikes and Oil And Gas Migration Amentioning

confidence: 99%

Features of the fault system and its relationship with migration and accumulation of hydrocarbon in Liaodong Bay

Gong

et al. 2011

Pet. Sci.

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“…3). There is a positive correlation between the sterane ratios C 29 20S/(20S+20R) and C 29 ββ/(ββ+αα) (Hao et al, 2011(Hao et al, , 2009a. These maturity parameters indicate that the crude oils here were mostly generated at the stage of peak oil generation.…”

Section: Origin Of Crude Oilmentioning

confidence: 73%

Key elements controlling oil accumulation within the tight sandstones

Zeng

Liu

2015

J. Earth Sci.

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Tight oil sandstone reservoirs with low porosity and permeability, which are an unconventional petroleum resource, have been discovered in the Jurassic intervals of the central Junggar Basin, the northwestern China. To reveal the accumulation mechanism, a relatively comprehensive research was conducted, including oil-source correlation, porosity evolution, and hydrocarbon charging history. The results show that crude oil of these tight sandstone reservoirs were mainly from Permian source rocks with some contribution from Jurassic source rocks. The reservoirs were buried at shallow depth (<3 100 m) and exposed to weak diagenesis, and thus had high porosity (18.5%) when the Permian-sourced oil from Permian source rock was charging, indicating high GOI values (>5%). In contrast, the sandstone reservoir had already become tight and did not provide available space to accumulate oil due to severe compaction and cementation when hydrocarbon from Jurassic source rock filled, evidenced by low GOI values (<5%). Therefore, reservoir porosity controls the oil accumulation within tight sandstone. Whether tight sandstone reservoirs accumulate oil depends on the reservoir quality when hydrocarbons charge. Before the exploration of tight oil sandstone reservoirs, it should be required to investigate the relationship between oil charging history and porosity evolution to reduce the exploration risk and figure out the available targets.

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“…The Bohai Bay Basin is one of the most petroliferous basins in China, accounting for nearly one third of the total oil production of the country [26]. The Bozhong depression, one of the six major subbasins of the Bohai Bay Basin [24], lies in offshore North China (namely, Bohai Bay), and structurally includes the Bozhong, Bodong, Huanghekou and Miaoxi sags as well as the Shijiutuo, Shaleitian, Bonan, Bodong and Miaoxi (low) uplifts ( Figure 1).…”

Section: Geological Settingmentioning

confidence: 99%

“…The PL19-3 oilfield lies in the east Bonan low uplift which is surrounded by four sags: the Bozhong and Bodong sags to the north, the Huanghekou sag to the southwest and the Miaoxi sag to the east (Figure 1). Previous studies indicated that all sags contain three source rock intervals, i.e., the third and the first members of Eocene Shahejie Formation (E 2 s 3 and E 2 s 1 ) and the third member of Oligocene Dongying Formation (E 3 d 3 ) [23,26]. All these intervals contain hydrogen-rich organic matters [31][32][33][34].…”

Section: Sufficient Oil Supply From Multiple Kitchens and Multiple Acmentioning

confidence: 99%

Late-stage rapid accumulation of the PL19-3 giant oilfield in an active fault zone during Neotectonism in the Bozhong depression, Bohai Bay

Zou

Gong

Teng

et al. 2011

Sci. China Earth Sci.

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Mechanisms for oil depletion and enrichment on the Shijiutuo uplift, Bohai Bay Basin, China

Cited by 85 publications

References 59 publications

Features of the fault system and its relationship with migration and accumulation of hydrocarbon in Liaodong Bay

Features of the fault system and its relationship with migration and accumulation of hydrocarbon in Liaodong Bay

Key elements controlling oil accumulation within the tight sandstones

Late-stage rapid accumulation of the PL19-3 giant oilfield in an active fault zone during Neotectonism in the Bozhong depression, Bohai Bay

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