Geological Conditions of Oil and Gas Enrichment in Carbonate Reservoirs of Tazhong Area, Tarim Basin
Received date: 2009-06-08
Revised date: 2009-08-04
Online published: 2009-10-10
The Tazhong paleo uplift is a multiple oil gas accumulation play, and medium large scale reservoirs have been found in the Carboniferous, Silurian, Ordovician and Cambrian Systems. The achievements in oil-gas exploration and exploitation and the researches on its petroleum geology show that large scale reef flat deposit of Tazhong No.1 slope-break zone, large weathering crust of the karst reservoir are the most important exploration areas for large and oversize oil-gas fields. First, the inherited paleo uplift is the foundation of oil-gas migration and accumulation; Second, multiple charging sites and multistage pump type charging are the key factors for wide distribution and local enrichment of oil and gas in marine carbonate reservoirs of the Tazhong area; Third, multiple pore-cave fracture carbonate reservoirs of high quality are the preconditions for large scale unconventional condensate oil gas fields. In a word, the Upper Ordovician reef flat deposit and the Lower Ordovician weathering crust karst reservoir are important exploration areas, where oil and gas are widely distributed in lateral and vertical directions.
Key words: Reef flat deposit; Unconformity; Karst reservoir; Tazhong paleo; uplift; Tarim basin.
WANG Fu-Huan, WANG Qiao-Meng, HAN Jian-Fa, XU Gong-Feng, JI Yun-Gang, DIAO Kuan-Zhi- . Geological Conditions of Oil and Gas Enrichment in Carbonate Reservoirs of Tazhong Area, Tarim Basin[J]. Natural Gas Geoscience, 2009 , 20(5) : 695 -702 . DOI: 10.11764/j.issn.1672-1926.2009.05.695
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