Diagenesis Influence Of Oil And Gas Accumulation Process In Different Structural Belt

GuLongNan area contains rich oil and gas resources, especially the Putaohua oil layer, along with the further development of reservoir, found that for the area of reservoir diagenesis and its efforts in the research on the control action of hydrocarbon accumulation is insufficient, progress is slow, and there has been no major breakthroughs were made. In according to the division of tight sandstone reservoir of standard research and previous research achievements in this area show that GuLongNan putaohua reservoir in central syncline is belong to tight sandstone reservoir, and the diagenesis of tight sandstone reservoir have a great effect on accumulation and oil-water distribution of macro control, therefore, this paper carried out GuLongNan putaohua oil layer in different tectonic units of diagenetic characteristics research on the control action of hydrocarbon accumulation.On the basis of the data collected in the studied area, based on the common chip,the casting thin sections, scanning electron microscopy(sem), mercury intrusion analysis, features and geochemical data, the feldspathic lithic sandstone is the mainly skeletal debris, smectite and chlorite is the mainly authigenic mineral, the diagenetic sequences are presented, and then combined with X-ray diffraction analysis, scanning electron microscopy(sem), and the collected data of vitrinite reflectance(Ro) and the maximum pyrolysis temperature(Tmax), and other data, determine the rock diagenesis into middle A stage, and then determine the diagenetic sequence symbiosis stage. Through the casting thin sections observation, combined with core mercury injection data and logging data and system measured porosity, determine the pore types and structure, finally studies the reservoir space and reservoir physical property characteristics. On the basis of diagenesis research, combined with the regional tectonic characteristics and developmental characteristics of sedimentary facies, based on the different structural parts in the study area of the main controlling factors of hydrocarbon accumulation in the analysis, proposed the slope zone and the syncline area within the favorable oil and gas enrichment area.