Characteristics of sandbody and sedimentary facies of Yan 8 reservoir of Yan'an formation in X Area

Abstract

In order to promote the exploration and development of oil reservoirs in northern Shaanxi, using core, mud logging and logging data, the study on the characteristics of sand bodies and sedimentary facies of Yan 8 oil layer group in X area was carried out. Based on the core description, the analysis of single-well sedimentary facies, continuous-well sedimentary facies, and planar sedimentary facies is carried out. It is believed that the Yan 8th section of the study area is a river-controlled delta plain environment, with three main developments: distributary channels, natural dikes and interbranch swamp Microphase. Vertically, the sand bodies in the Yan 8 oil layer group are discontinuous, and there are mainly distributary channels and inter-branch swamps. Horizontally, the Yan 8 oil layer group develops 10 river channels, which are distributed in a strip on the plane, and the extension direction is northwest-south east. Channel deposits constitute the main body of the sand body skeleton and are also the main oil and gas enrichment area.