Characteristics and hydrocarbon accumulation model of total petroleum system in shallow and medium strata in northern Songliao Basin, NW China

ZHANG He, WANG Xiaojun, JIA Chengzao, LI Junhui, MENG Qi&#x02019;an, JIANG Lin, WANG Yongzhuo, BAI Xuefeng, ZHENG Qiang

doi:10.11698/PED.20230054

0 20230818 - 20230818

DOI: https://doi.org/10.11698/PED.20230054

Characteristics and hydrocarbon accumulation model of total petroleum system in shallow and medium strata in northern Songliao Basin, NW China

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1. PetroChina Daqing Oilfield Company Limited, Daqing 163458, China;
2. China National Petroleum Corporation, Beijing 100724, China;
3. Exploration and Development Research Institute of PetroChina Daqing Oilfield Company Limited, Daqing 163712, China;
4. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
5. Exploration Department of PetroChina Daqing Oilfield Company Limited, Daqing 163453, China

Received date: 2023-02-07

Revised date: 2023-06-26

Online published: 2023-06-30

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Abstract

Based on the oil and gas exploration practice in the Songliao Basin, combined with the latest exploration and development data such as seismic, well logging and geochemistry, the basic geological conditions, oil and gas types and distribution characteristics, reservoir-forming dynamics, source-reservoir relationship and hydrocarbon accumulation model of the total petroleum system in shallow and medium strata in the northern part of Songliao Basin are systematically studied. The shallow-medium strata in northern Songliao Basin have the conditions for the formation of total petroleum system, with sufficient oil and gas sources, diverse reservoir types and well-developed drainage system, forming a total petroleum system centered on the source rocks of the Cretaceous Qingshankou Formation. Different types of oil and gas resources in the total petroleum system are correlated with each other in terms of depositional system, lithologic association and physical property changes, and they, to a certain extent, have created the spatial framework with orderly symbiosis of shallow-medium conventional oil reservoirs, tight oil reservoirs and shale oil reservoirs in northern Songliao Basin. Vertically, the resources are endowed as conventional oil above source, shale oil/tight oil within source, and tight oil below source. Horizontally, conventional oil, tight oil, interlayer-type shale oil, and pure shale-type shale oil are developed in an orderly way, from the margin of the basin to the center of the depression. Three hydrocarbon accumulation models are recognized for the total petroleum system in northern Songliao Basin, namely, buoyancy-driven charging of conventional oil above source, retention of shale oil within source, and pressure differential-driven charging of tight oil below source. The new understanding of the total petroleum system in northern Songliao Basin provides a new clue for overall exploration of oil and gas resources and will contribute to the efficient exploration of remaining resources and the rapid discovery of new strata/fields in the basin.

Key words： Songliao Basin; total petroleum system; super basin; conventional oil; tight oil; shale oil; hydrocarbon accumulation model; orderly symbiosis; differential accumulation

Cite this article

ZHANG He, WANG Xiaojun, JIA Chengzao, LI Junhui, MENG Qi’an, JIANG Lin, WANG Yongzhuo, BAI Xuefeng, ZHENG Qiang . Characteristics and hydrocarbon accumulation model of total petroleum system in shallow and medium strata in northern Songliao Basin, NW China[J]. Petroleum Exploration and Development, 0 : 20230818 -20230818 . DOI: 10.11698/PED.20230054

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