Research On Reservoir Characteristics And Mail Controlling Factors Of2ed Of The Jialingjiang Formation In Southern Sichuan

In recent years, the focus of China’s oil and gas exploration direction is from the east to the west, by land opposite marine, from clastic rocks to carbonate rocks by transfer, in marine carbonate rock oil and gas exploration job obtains significant progress. The study area of dangfengchang field-tanghe field are slope of Luzhou palaeohigh,member2of the lower triassic jialingjiang formation are believed to be the targets of petroleum exploration in the south of Sichuan region. The gas field is a strong heterogeneity gas pool with huge area, low pressure, low permeability and low reserve abundance, reservoir characteristics, and reservoir-forming conditions, hydrocarbon exploration in the basin is of great challenge. Reservoir identification and the main controlling factors plays an important role in oil and natural gas exploration and development. Therefore, The research on the geological conditions and key factors controlling the formation of Member2of the jialingjiang formation is of great significance to the development of natural gas industry.Based on the analysis of the research situation of carbonate rock reservoir, a detailed analysis of the problems and extensive data collection and digestion,papers utilizes the theories of carbonate sedimentology, reservoir physics,geology and geochemistry,reservoir geology, diagenesis, Logging geologic etc as a guide, Combined with the existing knowledge of southern Sichuan area, take advantage of the existing core data, drilling data and seismic data etc,by the method of combine the macroscopic means and microcosmic means, conventional means combine with the new technologies, new methods,theoretical analysis with the experimental means, geology combines with geochemistry, from the research methods and ideas that multidisciplinary combines with professional knowledge,seize the two main factors(sedimentation and diagenesis)that affect the formation and development of reservoir,and emphasis on their correlation and dependence. The paper emphasizes to look at petrologic property, diagenesis, reservoir space type, petrophysical property and pore structure, etc with an eye on the course of its development and dynamic evolution. This thesis mainly focus on geology, petrology, geochemistry and geochronoiogy, by which some new points are achieved:(1) Member2of the lower triassic jialingjiang formation formed in the restricted carbonate platform sedimentary environment, from which three subfacies and twenty microfacies can be recognized. the jialingj formation includes three cycles with sedimentary environments and By multiple tectonic movements, which makes the research of lithology diversity, reservoir space types diversity, and diagenesis. Complex. The rock types are mainly consists of limestone and dolomite, anhydrite and so on, in which the developed gypsolith is mainly as a cap.(2) Based on the study area and its adjacent area of cores of13wells and200pieces of cast Epoxy-saturated thin section observation, indicating that the diversity of reservoir space, The secondary pores (holes), part of the developmental caves and fracture, generally belongs to the low porosity and low permeability reservoir, due to crack as fluid migration in improving permeability plays a crucial role, through the permeability analysis, determine the District member2of the jialingjiang formation reservoir types of pore type and fracture pore type.(3) Diagenesis is the key of reservoir formation, This article by take the stagy of reservoir, diagenesis in research area is divided into two kinds:constructive diagenesis, destructive diagenesis. The compaction and cementation are the main destructive diageneses but the corrosion and karstification are the main constructive diageneses. The secondary solution pores and fractures caused by the karstification are well developed in the limestones, which were subjected to leaching and dolomitization during later diagenesis. It is deemed that sedimentation is of a certain control to the reservoir. Cementation, recrystallization made the whole longtou reservoir poor physical property but the dissolution, dolomitization and tectonism partly improve the reservoir.(4) Reservoirs subjected to lithology, sedimentary facies belt, and diagenesis, among them dolomitization and dissolution are the controlling factorsfor the development of secondary porosity. Member2of the jialingjiang formation is the restricted platform facies, Sea level changes frequently makes lithology diversity, is the control of primary space development and secondary porosity development favorable sites, the interaction among the two control reservoir development.