鄂尔多斯盆地东南部石炭系本溪组沉积微相特征及其对天然气富集控制作用
A Study on Sedimentary Microfacies of Benxi Formation and Its Controlling Effect on Gas Enrichment in Yanchang District of Ordos Basin
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摘要: 综合利用钻井、测井资料，结合邻区露头调查，深入分析鄂尔多斯盆地东南部天然气主要勘探层系石炭系本溪组沉积微相及其砂体分布特征，认为鄂尔多斯盆地东南部本溪组主要发育障壁海岸沉积体系及陆棚沉积体系，并进一步划分出砂坪、混合坪、泥坪、泥灰坪、障壁砂坝、泻湖泥、泥质陆棚7种沉积微相；障壁砂坝及砂坪砂体是天然气储集的骨架砂体，其发育完全受控于沉积相带的展布；本溪组主要产气层“晋祠砂岩”为障壁砂坝及潮汐砂坪成因，障壁主砂坝呈北北东—南南西展布；小砂坝则零星分布，砂坪呈北北西—南南东展布，2类砂体发育区是本溪组天然气勘探有利目标区。Abstract: This paper studies sedimentary microfacies and sand body distribution of Benxi Formation in Yanchang District of Ordos Basin on the basis of field materials, core data, logging curves and former proofs. Holding Results have shown that the sedimentary microfacies mainly evolves from barrier coast despositionaldepositional system and shelf despositionaldepositional system, it and can be classifiesd into seven types, including them into sand flat, mixed flat, muddy flat, mud-ashy flat, barrier sand dam, lagoonal mud and muddy shelf, among which barrier sand dam and sand flat are the framework sand body for gas reservoir, whose occurrence is totally controlled by the distribution of sedimentary facies belt. The major gas-producing reservoir of Benxi Formation which is Jinci sandstone is originated from barrier sand dam and tidal sand flat, with the main sand dam distributing in NNE-SSW direction. Small sand dams are distributed sporadically while sand flat extends in NNW-SSE direction. In conclusion, the development districts of both barrier sand dam and sand flat are favorable target areas for gas exploration in Benxi Formation.
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