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Heterogeneity and differential hydrocarbon accumulation model of deep reservoirs in foreland thrust belts: A case study of deep Cretaceous Qingshuihe Formation clastic reservoirs in southern Junggar Basin, NW China

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Petroleum Exploration and Development 2023年第2期50卷 360-372页

作者： GAO Chonglong WANG Jian JIN Jun LIU Ming REN Ying LIU Ke WANG Ke DENG Yi College of Petroleum China University of Petroleum(Beijing)at KaramayKaramay 834000China Research Institute of Experiment and Detection of PetroChina Xinjiang Oilfield Company Karamay 834000China College of Geosciences Northeast Petroleum UniversityDaqing 163318China College of Geosciences China University of Petroleum(Beijing)Beijing 102249China

Using the data of drilling, logging, core, experiments and production, the heterogeneity and differential hydrocarbon accumulation model of deep reservoirs in Cretaceous Qingshuihe Formation(K1q) in the western section of the foreland thrust belt in southern Junggar Basin are investigated. The target reservoirs are characterized by superimposition of conglomerates, sandy conglomerates and sandstones, with high content of plastic clasts. The reservoir space is mainly composed of intergranular pores. The reservoirs are overall tight, and the sandy conglomerate has the best physical properties. The coupling of short deep burial period with low paleotemperature gradient and formation overpressure led to the relatively weak diagenetic strength of the reservoirs. Specifically, the sandy conglomerates show relatively low carbonate cementation, low compaction rate and high dissolution porosity. The special stress-strain mechanism of the anticline makes the reservoirs at the top of the anticline turning point more reformed by fractures than those at the limbs, and the formation overpressure makes the fractures in open state. Moreover, the sandy conglomerates have the highest oil saturation. Typical anticline reservoirs are developed in deep part of the thrust belt, but characterized by "big trap with small reservoir". Significantly, the sandy conglomerates at the top of anticline turning point have better quality, lower in-situ stress and higher structural position than those at the limbs,with the internal hydrocarbons most enriched, making them high-yield oil/gas layers. The exponential decline of fractures makes hydrocarbon accumulation difficult in the reservoirs at the limbs. Nonetheless, plane hydrocarbon distribution is more extensive at the gentle limb than the steep limb.

关键词： foreland thrust belt deep reservoir heterogeneity differential hydrocarbon accumulation Cretaceous Qing-shuihe Formation gt1 well Gaoquan structural belt southern Junggar Basin

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