Geochemical Characteristics of Lower Cretaceous Source Rocks and Thermal History in the Huhehu Depression, Hailar Basin

被引：3
|
作者：
Cui J. [1 ,2 ,3 ]
Zhao J. [1 ]
Ren Z. [1 ,2 ]
Jin W. [4 ]
Xing L. [1 ]
Wang Y. [1 ]
机构：
[1] Department of Geology, Northwest University, Xi'an
[2] State Key Laboratory of Continental Dynamics, Northwest University, Xi'an
[3] National & Local Joint Engineering Research Center for Carbon Capture and Sequestration Technology, Xi'an
[4] Daqing Oilfield Exploration and Development Research Institute, PetroChina, Daqing
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2020年 / 45卷 / 01期
关键词：
Geochemical characteristics; Hailar basin; Huhehu depression; Main hydrocarbon accumulation period of oil and gas; Petroleum geology; Source rock; Thermal history;
D O I：
10.3799/dqkx.2018.300
中图分类号：
学科分类号：
摘要：
The Huhehu depression, located in the southern of Hailar basin, has favorable oil generating conditions. 270 pyrolysis data and 125 vitrinite reflectance data from 7 wells in the study area are used to analyze the geochemical characteristics and thermal history of Lower Cretaceous source rocks. Results show that the organic matter types of the Lower Cretaceous source rocks are mainly kerogen type Ⅲ-Ⅱ2, and the thermal maturity of the source rocks is characterized by high in the middle and low on all sides. The Nantun Formation belongs to the medium-good source rock with high maturity, which entered the threshold of hydrocarbon generation about 128 Ma, now in high mature to gas generation stage. The Damoguaihe Formation belongs to the poor-medium source rock, which entered the hydrocarbon generating threshold about 124 Ma, and now in the medium to low mature stage, the second member hydrocarbon source rock of Damoguaihe Formation has not entered the peak of hydrocarbon generation up to now. The simulation results of thermal history show that the Huhehu depression has reached the maximum paleogeotemperature at the end of the sedimentary period of Yimin Formation, and the geothermal evolution has the characteristics of increase firstly and then decrease. From the beginning of the Nantun Formation, the geothermal gradient gradually increased to 50-55 ℃/km, and then decreased to 35.4 ℃/km now. The higher geothermal field since the Early Cretaceous controlled the formation and accumulation of oil and gas. The inclusion homogenization temperatures and thermal history results indicate that 126-87 Ma(the sedimentary period of Yimin Formation)should be the main hydrocarbon accumulation period in Huhehu depression. As the strata were denuded, and the temperature decreased, the hydrocarbon generated and hydrocarbon expulsed process became weak due to the uplift of the Hailar basin since Late Cretaceous. © 2020, Editorial Department of Earth Science. All right reserved.
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页码：238 / 250
页数：12
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