磨溪气田嘉陵江组二段陆表海台地高频层序发育特征及对储层的控制

doi:10.11743/ogg20160511

Abstract

Abstract: High-frequency sequences,generally formed in basins with stable subsidence settings and correspond well to astronomical Milankovitch cycles,are vivid records of high-frequency eustatic flucturation.Such sequences developed in epicontinental platforms of non-coastal sedimentary environment are both representative and special in certain ways.By combining core observations,thin section analyses and logging facies studies with such factors as energy environment,eustatic fluctuation and sea water salinity cycle as well as reservoir genesis types under high-frequency sequential framework,we classified high-frequency sequences in the epicontinental carbonate platform of the Jia 2 member of the Moxi gas field into the following three types:platform flat type,intraplatform shoal type and lagoon type.The sequences are found to be characterized by widely-distributed gypsiferous rocks and grainstone with all kinds of exposure marks.As a whole,they consist of stratigraphic assemblages of shallowing upwards sequences.Within the framework,sequences are separated by clear boundaries and stratigraphic assemblages are stable and highly comparable.The paper also discussed the mechanisms behind the formation of early reservoirs in the high-frequency sequence framework and proposed that the high-frequency sequences controlled the order of lithofacies development and the syngenetic karstification,and thus controlled the development of different genetic types of reservoirs.

Key words: high-frequency sequence, carbonate rock, Jialinjiang Formation, epicontinental sea platform, Moxi gas field

CLC Number:

TE121.3

Liu Hong, Wang Gaofeng, Liu Nan, Qiao Lin, Ding Wei, Ding Xiong, Duan Hongzhen, Tan Xiucheng. Characterization of high-frequency sequences in the epicontinental carbonate platform of Jia 2 member in Moxi gas field and its controls over reservoirs[J]. Oil & Gas Geology, 2016, 37(5): 713-720.

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Characterization of high-frequency sequences in the epicontinental carbonate platform of Jia 2 member in Moxi gas field and its controls over reservoirs

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