Evolution characteristics and potential area prediction of shale in Wuerxun Sag
YANG Song-Lin1, LI Yan2, LIU Ya-Xuan3, YANG Xue3, JIANG Wen-Bo4
1. Yantai Gold College,Yantai 264000,China 2. School of Earth Sciences, Northeast Petroleum University, Daqing 163318,China 3. Laojunmiao Oil Production Plant of Yumen Oilfield Company, PetroChina, Jiuquan 735019,China 4. Exploration and Development Research Institute of Qinghai Oilfield, Dunhuang 736200,China
Wuerxun Sag is an important oil-bearing area in the south of Hailaer basin, which has great exploration potential. This paper determines the main source rocks in Wuerxun Sag by oil source correlation, analyzes the development characteristics of source rocks in different regions and geochemical indicators such as organic matter abundance and type, evaluates the oil generation maturity and accumulation stage of main source rocks in Wuerxun Sag, and judges the oil and gas filling history and predicts the preferred exploration potential position by measuring the homogenization temperature of fluid inclusions. It is found that the oil source in different areas of Wuerxun Sag is not identical. The oil reservoir in the north of Wuerxun Sag is derived from the parent material of mud shale rock of Nantun formation. In the south of Wuerxun Sag, besides the mud shale of Nantun formation, there is oil flow from dark mudstone of Tongbomiao formation. Wuerxun Sag has two stages of hydrocarbon accumulation: The first stage is from the later Yimin formation to the early Qingyuangang formation; The second stage is the late structural activity of Qingyuangang formation, which makes the early oil reservoir redistribute and inject new traps. It is considered that the west side of Wubei sag and the east side of Wunan sag are two important exploration potential zones.
杨松林, 李岩, 刘亚轩, 杨雪, 蒋文博. 乌尔逊凹陷泥页岩演化特征及潜力区预测[J]. 物探与化探, 2021, 45(4): 906-912.
YANG Song-Lin, LI Yan, LIU Ya-Xuan, YANG Xue, JIANG Wen-Bo. Evolution characteristics and potential area prediction of shale in Wuerxun Sag. Geophysical and Geochemical Exploration, 2021, 45(4): 906-912.
Qi S L. Subdivided multilayer fracturing technology for the thin and poor reservoirs of hailer oilfield[J]. Petroleum Geology and Oilfield Development in Daqing, 2015,34(5):81-86.
Wu W X, Zhang H Y, Li Z D, et al. Sequence stratigraphic geochemistry and its application in evaluation of source rocks: taking Beier sag of Hailar Basin as an example[J]. Oil & Gas Geology, 2015,36(4):705-710.
Shi W J. Analogical analysis of hydrocarbon source conditions between central fault depression and peripheral depression in Hailaer Basin[J]. West-China Exploration Engineering, 2016,30(4):39-46.
Xu L H, Song B Q, Han S, et al. Application of variable-scale structure modelon geostatistics inversion reservoir prediction[J]. Acta Petrolei Sinica, 2019,40(2):190-196.
[6]
Tissot B P, Pelet R, Ungerer P. Thermal history of sedimentary basins, maturation indices,and kinetics of oil and gas generation[J]. AAPG Bull., 1987,71(12):445-466.
Liu C Y, Yan X B, Xu X H, et al. Application of fluid inclusion to the study of hydrocarbon charge history of the south slope in the Huimin Sag[J]. Oil & Gas Geology, 2008,29(4):507-510.
[10]
崔军平. 海拉尔盆地热演化史与油气成藏史研究[D]. 西安:西北大学, 2014, 15-56.
[10]
Cui J P. Geothermal evolution and hydrocarbon accumulation history of Hailaer Basin[D]. Xi'an:Northwest University, 2014: 15-56.
Wang C, Zhang A D. Reservoir characteristics and pore evolution of Wuerxun-Beier Sag in Hailar Basin[J]. Petroleum Geology & Oilfield Development in Daqing, 2019,38(5):151-159.
