| Qingdao Institute of marine geology, China Geological Survey | Host |
| Citation: |
YU Zhongkun, ZHAO Hong, DIAO Hui, DING Fei, QI Binwen. Thermal evolution modeling and present geothermal field of the Lishui Sag of East China Sea Basin[J]. Marine Geology & Quaternary Geology, 2020, 40(2): 124-134. doi: 10.16562/j.cnki.0256-1492.2019061402
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Thermal evolution modeling and present geothermal field of the Lishui Sag of East China Sea Basin
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Abstract
Hydrocarbon source rocks are deeply buried in the Lishui Sag of East China Sea Basin, where drilling wells are rare and encountered only a few oil and gas discoveries. There are hot debates over the hydrocarbon generating capacity of the basin. Careful study has been made for this time to clarify the thermal evolutionary history of source rocks. Starting from drilling wells with measured formation temperature and vitrinite reflectance (Ro) data, using the forward simulation method, and through the correlation between temperature and stratum depth, we extrapolated the results of drilling temperature research to non-well areas. On the basis of restoring lithospheric structure and its evolution history, the regional geothermal field of the Lishui Sag has been systematically established for the first time. The impacts of geothermal field onto source rock evolution are analyzed. Data shows, most of the source rocks at the bottom of Yueguifeng Formation in the lower part of Paleocene are mature and the sub-depression center is partly over-matured; most of the source rocks at the top of Yueguifeng Formation are in the stage of low-maturity and maturity, the sub-depression center is partly high-mature to over-mature; the source rocks at the top of the Lingfeng Formation are immature to low-maturity, and there are mature source rocks at the center of the western sub-depression. According to the analysis of source rock characteristics and evolution, the source rocks in the lower Paleocene Yueguifeng Formation should be the main source rocks for hydrocarbon generation in the Lishui Sag.
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References
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YU Zhongkun, ZHAO Hong, DIAO Hui, DING Fei, QI Binwen. Thermal evolution modeling and present geothermal field of the Lishui Sag of East China Sea Basin[J]. Marine Geology & Quaternary Geology, 2020, 40(2): 124-134. doi: 10.16562/j.cnki.0256-1492.2019061402
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Figure 1.
Tectonic location of Lishui Sag
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Figure 2.
Seismic profile across Lishui Sag
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Figure 3.
Thermal history simulation process for Lishui Sag
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Figure 4.
Erosion thickness of horizon T20 in Lishui Sag
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Figure 5.
Contrast of DST temperature and BHT calibration data in Lishui Sag （Left: LS6, Right: LS9）
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Figure 6.
Burial history and simulated calibration of thermal history of LS5
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Figure 7.
Modeling temperature curves of the wells in Lishui Sag （Data points are measured data）
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Figure 8.
Diagram of the relationship between the bottom temperature of Yueguifeng Formation from wells and the buried depth of T100 in Lishui Sag
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Figure 9.
Geothermal distribution of T100 in Lishui Sag
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Figure 10.
Average geothermal gradient in Lishui Sag
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Figure 11.
Heat flow of wells in Lishui Sag
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Figure 12.
Distribution of heat flow in Lishui Sag
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Figure 13.
Maturity of source rocks at the bottom of Yueguifeng Formation in Lishui Sag
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Figure 14.
Maturity of source rocks at the top of Yueguifeng Formation in Lishui Sag
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Figure 15.
Maturity of source rocks at the top of Lingfeng Formation in Lishui Sag