Research On The Volcanic Rocks Reservoir Characteristics Of Harjiawu Formation In Malang Sag Of Santanghu Basin

In Volcanic exploration,Santanghu basin Malang depression has made a breakthrough,submitted a large oil and gas reserves,but the volcanic reservoirs in the formation of a complicated process influenced by many factors,the study is relatively weak,weak for the Malang depression reservoir characteristicsdifficulties,make full use of the core observation,thin section analysis,elemental analysis,physical analysis,well logs,seismic data analysis applications,comprehensive study of the reservoir characteristics and influencing factors of Malang depression,analysis of the volcanic lithology,lithofacies,breakage and integrated control of the volcanic reservoir in the area of volcanic reservoirs in the comprehensive evaluation,and pointed out the favorable zones and objectives of the exploration.Study area the HarJiawu group can be divided in four eruption cycles;development of lithology-the base of the basalt,andesite and the transition between the rock composition,affected by late diagenetic transformation of the role of the prevalence of rock-forming minerals more serious alteration;volcanic facies are mainly outbreak phase,overflow and volcanic sedimentary facies,seismic profiles can also identify the invasion phase and the volcanic conduit;volcanic reservoir in the reservoir space is more complicated,according to the formation of the stage can be divided into two major categories of primary and secondary storage space,analyzes and summarizes the main diagenetic types of reservoir development;from the analysis of reservoir properties,the properties of volcanic breccia best basalts,followed by overall performance for the low porosity and low permeability reservoirs;summary of the corresponding characteristics of the logging reservoir is divided into four categories,and summarizes the effective reservoir development areas and layers of law;summarizes the area volcanic earthquake response characteristics of that area volcanic rock reservoir is mainly concentrated in the development of the weathering crust band of fracture zone,as well as closely linked to the favorable facies and reservoir-seal.