四川盆地奥陶系储层发育特征与勘探潜力

doi:10.11743/ogg20140311

Abstract

Abstract:

The Ordovician has been the only strata with no comericial gas discoveries from the Sinian to Jurassic in Sichuan Basin.The Honghuayuan Fm.and the Tongzi Fm.of the Lower Ordovician share a similar sedimentary environment with the Longwangmiao Fm of the Cambrian and the Jialingjiang Fm of the Triassic,and the latter two formations were proven to contain large gas fields in their carbonates of grain beach facie.Based on an integrated analysis of drilling,seismic and regional geological data of the basin,we obtained the following conclusions.1)The lower Ordovician had the geological conditions needed for forming grain beach.The mound reflections on seismic profiles of southeastern Sichuan Basin are the responses of grain carbonate interbedded with gypsum and mudstone in the Tongzi Fm and the Honghuayuan Fm.2)There are two types of source rock-reservoir combinations in the Lower Ordovician,namely lower source rock-upper reservoir combination and upper source rock-lower reservoir combination.3)According to the exploration expe-riences in the Cambrian and Triassic of central Sichuan Basin,study should be performed in respects of sedimentary facies,paleo-geomorphology and hydrocarbon accumulation and evolution history with carrier system as the focus for exploration in the Ordovician.An exploration well should be emplaced in area with prominent anomaly reflections.

Key words: grain beach, source rock-reservoir combination, Lower Ordovician, Sichuan Basin

CLC Number:

TE122.2

Guo Tonglou. Charateristics and exploration potential of Ordovician reservoirs in Sichuan Basin[J]. Oil & Gas Geology, 2014, 35(3): 372-378.

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Charateristics and exploration potential of Ordovician reservoirs in Sichuan Basin

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