Study on sedimentary facies of mixed clastic-carbonate sediments strata system in epicontinental sea ——A case of Daniudi Gasfield in northeastern Ordos
Guo Shuyuan1,2, Zhang Guangquan1, Chen Shuwei1
1 Research Institute of Petroleum Exploration & Production，SINOPEC， Beijing 100083 2 North China Petroleum Bureau， SINOPEC，Zhengzhou 450006，Henan
Abstract：The mixed clastic-carbonate sediment is the important sediment phenomenon which can react characteristic deposits of the epicontinental sea. The Benxi and Taiyuan Formations in the Daniudi Gasfield located in the northeast of Ordos are typical series of the mixed clastic-carbonate sediments deposited in the epicontinental sea. According to these features on lithologic assemblage with the study on regional geology， the pattern has been first created on sedimentary facies of the mixed clastic-carbonate sediments in the epicontinental sea in this paper. Sedimentary environment of Benxi and Taiyuan Formations is numerously considered as barrier clastic coastal environment. Based on geologic setting and sedimentary evolutionary process of the coal bearing basin in North China during the Late Paleozoic，the Benxi and Taiyuan Formations in Daniudi Gasfeild belong to epicontinental sea clastic coastal-carbonate platform mixed depositional system and coastal plain depositional system in this paper. The lower member of the Benxi Formation of Upper Carboniferous belongs to restricted clastic coastal facies and upper member belongs to carbonate platform and clastic coastal facies. The Lower member of the Taiyuan Formation of Upper Carboniferous-Lower Permian belongs to delta facies and clastic coastal facies→clastic coastal facies，the middle member belongs to basin-controlled peat marsh facies→carbonate platform facies and clastic coastal facies， the upper member belongs to delta facies and clastic coastal facies→carbonate platform facies and clastic coastal facies→delta facies and clastic coastal facies→carbonate platform facies and clastic coastal facies.
Guo Shuyuan,Zhang Guangquan,Chen Shuwei. Study on sedimentary facies of mixed clastic-carbonate sediments strata system in epicontinental sea ——A case of Daniudi Gasfield in northeastern Ordos[J]. JOPC, 2009, 11(6): 611-627.
