Sedimentary Environment and Hydrocarbon Potential of Carboniferous in Wuwei Basin
Received date: 2010-07-14
Revised date: 2010-08-30
Online published: 2011-04-10
Carboniferous system in Wuwei basin, developing a coal\|bearing deposition with a thickness near 1000m, is a set of sedimentary strata of paralic clastic rocks and carbonate rocks. During the sedimentary period of Qianheishan Formation in early stage of Early Carboniferous, the Carboniferous strata only deposited in southern Wuwei basin with thickness of 100-150m. Due to the hot and dry climate, the depositional environment was mainly of salty lagoon and littoral-neritic facies.And the deposits were primarily composed of mottled clastic rocks, dolomite interlayer and gypsum which are poor source rocks. During the period of Chouniugou Formation in late stage of Early Carboniferous to Jingyuan Formation, Yanghugou Formation and Taiyuan Formation in Late Carboniferous, the climate changed to warm and humid, and the ingression range extended. Then the depositional thickness increased to 300-800m, with a sedimentary environment of desalting lagoon, littoral marsh, delta, littoral and neritic deposit. The main rocks were dark mudstone, shale, carbonaceous mudstone and limestone source rock.The organic content was much higher in carboniferous hydrocarbon source rocks around Wuwei basin, which was the main hydrocarbon-bearing source rocks in the basin, with the source reservoir cap assemblage of self generation and self accumulation. It can be concluded that Wuwei basin is a potential hydrocarbon bearing basin.
YAN Cun-Feng, YUAN Jian-Ying . Sedimentary Environment and Hydrocarbon Potential of Carboniferous in Wuwei Basin[J]. Natural Gas Geoscience, 2011 , 22(2) : 267 -274 . DOI: 10.11764/j.issn.1672-1926.2011.02.267
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