High-density Well Pattern Fluvial Delta System Sedimentary Microfacies Fine Characterization And Well Pattern Control Degree

Thick sandstone reservoirs have always been the focus of oilfield development attention and research.The Puyi Reservoir Formation in the Sazhong Development Zone has entered the post-polymer development stage,and the density of the well pattern in the study area has reached 126/km2,which is rare in China.All kinds of microfacies sand bodies have a very high drilling rate under the density of the well pattern.No matter the microfacies of the small deposits,the description of the profile or the distribution of heterogeneity,the density of the well pattern is relatively high.High degree of control.By investigating the evolution history of the well pattern in the study area,the micro-facies,sand bodies,and heterogeneous distribution laws of the key small layers under different well-pattern densities in different development periods are depicted,and the sedimentary micro-facies and sand are deposited under different well-pattern densities.The study of volume and heterogeneity control degree,in order to better summarize the differences in the understanding of underground in different periods of oilfield development,and provide a theoretical basis for the subsequent development of blocks based on similar sedimentary environments.Under the guidance of sequence stratigraphy,reservoir sedimentology and other theories,the study area was divided into strata,and the fine contrast of key small strata was completed.Subdivide the sedimentary system in the study area into microfacies and energy phase levels,and establish different microfacies and energy phase logging modes in different subfacies;use the principles of sedimentology and 862 logs to complete the analysis of time units and sedimentary microfacies.Description;as the study area has undergone multi-phase well pattern adjustment,according to the well pattern adjustment time and well pattern encryption area,4 batch well patterns with exponential power of 2 wells are divided,and key small layers under different sedimentary subfacies environments are depicted,Including meandering river facies,delta distributary plain subfacies,delta front subfacies,sedimentary microplanar distribution in the background,sand body distribution and heterogeneity under different density well patterns,flat and profile distribution maps,and summary The degree of control of sedimentary microfacies,sand body distribution and heterogeneity under different well pattern densities provides theoretical guidance for the next development of the oil field.