Sedimentary microfacies and sandbody distribution of the Member 8 of Xiashihezi Formation in horizontal well zone, central Sulige area, Ordos Basin
Lei Bianjun1, Li Yuegang2,3, Li Fuping2,3, Zhao Zhongjun2,3, Zhu Yajun2,3, Zhang Zhigang2,3, Xu Longbo1
1 School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, Sichuan
2 Sulige Gasfield Research Center of Changqing Oilfield Company, PetroChina, Xi’an 710021, Shaanxi
3 State Engineering Laboratory of Low Permeability Oil and Gasfield Exlporation and Development, Xi‘an 710018, Shaanxi
In order to meet the demand of arrangement,geosteering and track of the horizontal wells in Sulige Gasfield,Ordos Basin, the core survey,thin section appraisal,and analysis of vertical sequences and electrofacies were employed. Guided by depositional models of braided river,and based on the previous research results of the outcrops and modern quantitative reservoir sedimentology, the sedimentary microfacies and sandbody distribution in the horizontal well zone of the central Sulige area has been described finely. By analyzing the facies markers, sedimentary microfacies and depositional sequences of the lower Member 8of Xiashihezi Formation,as well as the detailed comparing of crowd well zone section, the statistics of reservoir sandbody thickness,and logging date of horizontal section in horizontal wells, the size parameters of reservoir sandbody are estimated. Three indexes(sand/stratum ratio,logging curve,reservoir sandbody) were studied out used to subdivide the sedimentary facies subfacies and microfaices. A map of sedimentary micro facies and sandbody distribution,which provides strong support for the horizontal well arrangement and geosteering.
Lei Bianjun,Li Yuegang,Li Fuping et al. Sedimentary microfacies and sandbody distribution of the Member 8 of Xiashihezi Formation in horizontal well zone, central Sulige area, Ordos Basin[J]. JOPC, 2015, 17(1): 91-106.
