1. Geophysical Research Institute, BGP, CNPC, Zhuozhou, Hebei 072751, China; 2. National Engineering Research of Coalbed Methane Development & Utilization, Beijing 110000, China; 3. PetroChina Coalbed Methane Company Limited, Beijing 110000, China
Abstract：S23 sub-member of Shiluobei block in the east margin of the Ordos Basin is the key stratum for tight gas exploration. There are few wells drilled in the block, and the degree of exploration is low. In addition, the reservoir in the S23 sub-member is thin and tight, with strong heterogeneity and fast lateral lithological change. Therefore, it is difficult for conventional methods to carry out prediction based on seismic data, which seriously restricts the exploration of tight gas. This paper comprehensively uses drilling and logging data and 3D seismic data to analyze paleogeomorphology, seismic attributes, and logging facies, and depicts the distribution of each sedimentary microfacies in the Shiloubei block. Furthermore, on this basis, the paper carries out facies-controlled geostatistical inversion to predict sand body distribution. The predicted sand body distribution is highly consistent with the sedimentary facies revealed by drilling. The research results provide a basis for the prediction of resources in the Shiloubei block and the subsequent drilling deployment.
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