Study On Micro-structural Characteristics Of Shen161 Block In Damintun Sag Of Liaohe Oilfield

Shen 161 block is an important development and regulation old area of Damintun sag in Liaohe oilfield in recent years, and Es32 sub-member oil reservoir as the interest layer of this study. This paper focuses on the analysis of micro structural features in the block to study the potential of remaining oil better.With the guidance of high-resolution sequence stratigraphy and based on 3D seismic data and logging curve data, fully collecting the previous research results, in this paper we builded the stratigraphic framework of Es32 sub-member in Shen 161 block and finished the stratigraphic division and correlation. Shen 161 block can be divided into 4 oil reservoirs, 26 sandstone groups and 58 small layers. Combined with the existing data, using well-seismic combination and static-dynamic combination,we carried out tectonic fine interpretation. We made a comprehensive analysis of structural characteristics of Es32 sub-member in Shen 161 block and interpreted 8 faults in this area, It consists of two kinds about a nearly east-west and north-south and all of them are normal faults in the sand of Es3.Based on the tectonic interpretation and sedimention model,we finshed the micro structural map of the main small layers. We identified seven types of micro structure and the micro-faulted nose and micro- faulted trough structure are more than others. We found 4 kinds of micro-structure of the top bottom configuration mode.The faults are grooved in Shen 161 block and tectonic forces is the major factor in the formation of the micro structure of this block. In this paper we defined the characterization method of micro-faulted nose and builded the quantitative relationship between micro faulted nose length and width;in addition, The magnitude and the fault structure of micro fault nose level is positively related to the fault distance.The relationship between micro-structure and remaining oil is close. In the micro structure of Shen 161 block, the positive microstructure is favorable on remaining oil enrichment;the top-convex bottom-convex micro structure configuration pattern of remaining oil enrichment is favorable; in the positive microstructure and underwater distributary channel microfacies superposition combination mode,the production of oil well is high.