关键词: 火山岩储层, 成岩作用, 孔隙演化, 石炭系, 滴西地区, 克拉美丽气田

Abstract:

With the deepening of the degree of oil and gas exploration, the dense carbonate exploration field developed near the sedimentary center of lake basin has attracted more and more attention. Through the review of many previous research results, it was found that the research of lacustrine carbonate diagenesis has gotten remarkable achievements in many fields, especially dolomitization which formed high quality reservoir in recent years, including the following aspects：（1） lacustrine carbonate deposition in China has the characteristics of long time span and wide distribution, including Permian, Jurassic, Cretaceous and Paleogene, and it distributed in the sag and slope zone of Junggar Basin, Santanghu Basin, Sichuan Basin and Qaidam Basin; （2） from the physical properties and lithology of reservoir about lacustrine carbonate in China, it is found that the dolomite and dolomitization rock in saline lacustrine developed often associated with shale symbiotic with the characteristic of medium porosity and ultra-low permeability, and the pore types are mainly dolomite intergranular pores; （3） the dolomitization models of lacustrine carbonate mainly include primary biogenic model, penecontemporaneous metasomatism model, hydrothermal metasomatism model and primary dolomitization model related to exhalative hydrothermal activities; （4）the geochemical analysis technologies about major and trace elements, carbon and oxygen isotope and strontium isotope were widely used in the research of lacustrine dolomite, and good results have been achieved.

Key words:  volcanic reservoirs , diagenesis , pores evolution , Carboniferous , Dixi area , Kelameili Gas Field