徐家围子断陷砂砾岩储层纳米-微米级孔隙的形成及其与天然气充注的关系

刘超; 陈海峰; 王洋; 陈掌星

doi:10.3799/dqkx.2017.593

Volume 43 Issue 5

May 2018

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Article Navigation > Earth Science > 2018 > 43(5): 1574-1586

Liu Chao, Chen Haifeng, Wang Yang, Chen Zhangxing, 2018. Formation of Nano-Micron Pores in Conglomerate Reservoirs of Xujiaweizi Fault Depression and Their Relationship with Natural Gas Filling. Earth Science, 43(5): 1574-1586. doi: 10.3799/dqkx.2017.593

Citation:

Liu Chao, Chen Haifeng, Wang Yang, Chen Zhangxing, 2018. Formation of Nano-Micron Pores in Conglomerate Reservoirs of Xujiaweizi Fault Depression and Their Relationship with Natural Gas Filling. Earth Science, 43(5): 1574-1586. doi: 10.3799/dqkx.2017.593

Citation:

Liu Chao, Chen Haifeng, Wang Yang, Chen Zhangxing, 2018. Formation of Nano-Micron Pores in Conglomerate Reservoirs of Xujiaweizi Fault Depression and Their Relationship with Natural Gas Filling. Earth Science, 43(5): 1574-1586. doi: 10.3799/dqkx.2017.593

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Formation of Nano-Micron Pores in Conglomerate Reservoirs of Xujiaweizi Fault Depression and Their Relationship with Natural Gas Filling

doi: 10.3799/dqkx.2017.593

1.
Exploration and Development Research Institute, Daqing Oilfield Co. Ltd., Daqing 163712, China
2.
Heilongjiang Province Key Laboratory of Formation Mechanism of Oil and Gas Reservoir and Resource Evaluation, Northeast Petroleum University, Daqing 163318, China
3.
Heilongjiang Province Key Laboratory of Unconventional Oil and Gas Reservoir and Development, Northeast Petroleum University, Daqing 163318, China
4.
The Department of Chemical and Petroleum Engineering, University of Calgary, Alberta T2N1N4, Canada

Received Date: 2017-10-01
Publish Date: 2018-05-15

Abstract

Abstract

Sandy on conglomerate gas prospecting in Shahezi Formation of Xujiaweizi depression has achieved initial success after several industrial gas flow wells had been drilled in reservoir space of nano-micron size. It is of great importance to determine the relationship between tight reservoir formation and natural gas charge for the exploration plan and "sweet spot" prediction. Based on the analysis of reservoir petrology, reservoir space and diagenetic evolution sequence, principal reasons and formation mechanism of nano-micron pores were determined through calculating the porosity changed by various diagenesis events. It is concluded that the quick subsidence and the huge mechanical compaction in the early diagenetic stage accelerated the damage of primary pores, resulting in the compacting of 'super-tight sandy conglomerates' which are rich in clay and plastic lithic fragments. 'Tight sandy conglomerates' which are rich in rigid components reached the tight grade in the later diagenetic process mainly due to the filling of carbonate cements, thus the formation of later carbonate cements corresponding to the densification threshold, after which the original pores reduced into nano-micron pores greatly. According to analysis of the homogeneous temperature of hydrocarbon inclusion in the calcite cement and burial-thermal history of Shahezi Formation, the compacting of sandy conglomerates happened around 2 500 m in depth and before 100 Ma. According to the comprehensive study of pore evolution history, hydrocarbon generation history and hydrocarbon filling history, gas accumulation occurred both before and after the compacting of sandy conglomerates. Before the compacting of sandy conglomerates, gas generated at a low speed and filled into the reservoir with a weak strength, forming some structural gas pools at the boundary of the depression, and therefore the upward direction of slope where micro amplitude structure developed is the favorable area for prospecting. The peak of gas accumulation occurred after reservoir compacting, characterized by high gas injection strength, forming widely distributed lithologic gas reservoirs, and thus the downdip direction of the slop where distributary channel sandbody developed and closely contact with main source rocks is the potential area for exploration.The comprehensive analysis indicates that the gas pool mainly formed after the reservoir tight with some formed before the reservoir compacting.
- tight,
- sandy conglomerate,
- reservoir,
- gas accumulation,
- Shahezi Formation,
- Xujiaweizi depression,
- petroleum geology

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References(60)

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