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Petroleum Geology & Experiment  2019, Vol. 41 Issue (5): 621-629    DOI: 10.11781/sysydz201905621
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Reasons for the failure of petroleum exploration wells from the process of hydrocarbon accumulation
JIN Qiang1, CHENG Fuqi1, WANG Qiutong1, WANG Tongshan2
1. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 26580 China;
2. Geological Branch, Institute of Petroleum Exploration and Development, PetroChina, Beijing, 100083, China
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Abstract  There are various reasons for subeconomic wells in oil and gas exploration, including the problems of geology, engineering and management, among which the most common problem is geology. The lack of oil and gas accumulation in the lost well H drilled for natural gas in the Dengying Formation (pre-Cambrian) in the western Sichuan Basin was considered using geochemical tools, which include the optical analysis of bitumen and homogenization temperatures and gas compositions of fluid inclusions in dolomites filled in the dissolved fractures and pores. Oil accumulation in the well H area was normal from the Middle Triassic to the Early Jurassic. Bitumen was oxidized and washed by flowing waters in the period of oil cracking to gas from the Middle Jurassic to Cretaceous. As a result, there was no natural gas accumulation in the well H anticlinal area since the anticline was tilted and cut by a fault. The well H anticline was restored again during neotectonics in the Cenozoic, but there was no gas charging in the anticline because no gas was generated from oil-cracking or source rocks. Therefore, the well H was dry. Structures or traps with normal oil charging and normal gas charging and neotectonic stability are potential targets for gas exploration in the Dengying Formation in the Sichuan Basin.
Key wordslost well      hydrocarbon accumulation process      geochemical analysis      Dengying Formation      Sichuan Basin     
Received: 16 April 2019      Published: 23 September 2019
ZTFLH:  TE122.3  
Cite this article:

.Reasons for the failure of petroleum exploration wells from the process of hydrocarbon accumulation[J].Petroleum Geology & Experiment,2019,41(5):621-629.

URL:

http://www.sysydz.net/EN/10.11781/sysydz201905621     OR     http://www.sysydz.net/EN/Y2019/V41/I5/621

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