Sedimentary microfacies and evolution of the Qianjiang Formation of Paleogene at Wangchang area in Qianjiang Sag,Jianghan Basin
Wang Guoli Yang Yuqing Zhang Yongsheng Qi Zhixian Qiao Yuedong Yuan Heran
1 Department of Science and Technology Development of China Petroleum and Chemical Corporation,Beijing 100029
2 Logging, WelltechChina Oilfield Services Limited , Beijing 101149
3 Institute of Mineral and Resources of Chinese Academy of Geological Sciences, Beijing 100037
4 Institute of Exploration and Development, Jianghan Oilfield Division of China
Petroleum and Chemical Corporation , Qianjiang 433124, Hubei
The Qianjiang Sag is a MesoCenozoic faulted saline basin, and bears abundant oil，gas and saltDuring the depositional period of the Qianjiang Formation (from Late Eocene to Early Oligocene),the tectonic activity and sedimentation infilling of the lacustrine basin were very active,thus forming the saltbearing rock series with a thickness of 4500 mThrough the detailed study on a total of about 151m thick cores in the interval of the Qianjiang Formation of wells Wangping 1,Wangyun 10-6 and Wang 80-2,of the Wangchang area，northwestern Qianjiang Sag,17 typical sedimentary microfacies are recognized,and 7 microfacies series are generalized according to origin,formation environment and rock typesThe characteristics of each microfacies are described,and the formation environment conditions are also analyzedThe evolution process or association types of the microfacies in the intervals between the salt beds of the Qianjiang Formation is complex and variousThe evaporation degree of the lacustrine basin was gradually increasing,and the water depth was gradually shallower from Member 4 to Member 2 of Qianjiang FormationAt last,the formation conditions of the Qianjiang saline basin and the evolution of the sedimentary environment are also analyzed briefly
. Sedimentary microfacies and evolution of the Qianjiang Formation of Paleogene at Wangchang area in Qianjiang Sag,Jianghan Basin[J]. JOPC, 2004, 6(2): 140-150.
