Control of sedimentary environments on gas contents of coal seams: a case study of No.15 coals bed of the Taiyuan Formation in Shouyang area,Qinshui Basin
KANG Shilong, LÜ Yumin, WANG Cunwu, WANG Bo, LI Zhuolun, ZHANG Yue
CNOOC Research Institute Co., Ltd., Beijing 100028, China
Abstract：The property of coal seams is a dominant factor for the enrichment and high-yield of coal-bed methane(CBM). Sedimentary environments control the distribution and thickness of coal seams,the maceral composition and properties of coal,and the superimposed model of surrounding rocks as well as their thickness,and thus controlling the enrichment of CBM. In this study,sedimentary environments and sequence stratigraphy of the Taiyuan Formation in Shouyang area,northern Qinshui Basin were analyzed based on drilling cores,loggings and previous studies. Lithofacies and palaeogeography of the roof and floor systems of the No.15 coal bed were described in detail. The relationship between sedimentary environments and gas contents of the CBM was finally summarized,and the favorable zone for CBM exploration was delineated. The lower part of the Taiyuan Formation in Shouyang area mainly developed in shallow marine shelf,barrier island,and lagoon depositional system,whereas the upper part formed in the delta plain. The Taiyuan Formation records a 3rd-order transgressive-regressive sequence,which can be further divided into six 4th-order sequences(S1-S6). The S1 mainly developed on tidal flat,lagoon and barrier island. The gas content of different sedimentary facies declines is an order from lagoon,tidal flat to barrier island. The S2 mainly formed in barrier island,lagoon,tidal flat,shallow marine shelf depositional system. The gas content declines in an order of lagoon(with thick limestone),muddy shelf,carbonate shelf,lagoon,tidal flat,and barrier island. According to the relationship between sedimentary facies of the S1 and S2 and gas content of No.15 coal bed,the CBM reservoir of No.15 coal bed was subdivided into three types. Type Ⅰ reservoir is favorable for CBM exploration,which is mainly distributed in the east of the research area. Type Ⅱ reservoir is relatively favorable for CBM exploration,which is distributed in the east and west of the research area. Type Ⅲ is of poor CBM exploration prospect,which is mainly distributed in the northwest and the middle area the research area.
. Control of sedimentary environments on gas contents of coal seams: a case study of No.15 coals bed of the Taiyuan Formation in Shouyang area,Qinshui Basin[J]. JOPC, 2024, 26(2): 416-430.
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