Control Of High-quality Source Rocks On Reservoir In Nanbeier Depression

With the increase in recent years, exploration efforts, Haita basin show very good prospects for oil and gas exploration, reservoir basin in Haita generally in the context of low porosity and permeability, how to find a relatively good quality reservoir (dessert) as scholar research topics are of particular concern. This paper Haita BellSouth central basin graben depression, for example, the general characteristics of the reservoir based on analysis of data combined with geochemical distribution and quality of source rocks, high-quality source rock of the reservoir properties, pore distribution and the secondary formation mechanism of high-quality reservoirs to predict reservoir quality distribution.Through more than 40 wells in the ordinary thin section, properties, mercury, cast thin section, scanning electron micrograph observation, particle size analysis, face rate of image analysis, geochemical analysis and testing of indoor test analysis of data, combined with field core observation described logging, logging data, the reservoir rock BellSouth sag characteristics, physical properties, geochemical characteristics of diagenesis and reservoir quality control of source rock analysis of the role.BellSouth depression lithology mainly developed two categories: ordinary sandstone and volcanic rocks, volcanic rocks further divided into tuffaceous sandstone and tuff. Sec to the basement from the big, depth from shallow to deep, common sand content decreased and the content increased volcanic rocks. Sec big, big section for ordinary sandstone lithology, excluding volcanic rocks; southern section of the reservoir is mainly ordinary sandstone content of about 91.8%, less content of volcanic rocks; southern section, copper bowl Temple of the reservoir rock to the main pyroclastic rocks, the content is greater than 60%, mainly tuffaceous sandstone, tuff and tuff only a small part of the normal sand content of less than 40%; basal tuff reservoir levels about 40% higher, tuffaceous sandstone, followed by about 31% sand content of about 27% of the ordinary.To abnormal development of porosity is characterized by high porosity zone, as there was not only dissolution, secondary porosity formed by dissolution, there is also the presence of the particles cladding preserved primary porosity, so the higher the porosity changes with depth part of the trend known as the anomalously high porosity zone. Total porosity decreases with the increase of depth, due to the presence of secondary porosity development of the five makes BellSouth depression with anomalously high porosity.High-quality source rock control on the role of reservoir properties is mainly reflected in two aspects: the early injection of hydrocarbons and organic acid corrosion. Early injection of hydrocarbon pore, pore fluid discharge can be delayed or inhibited diagenesis (mainly cementation) process, so that the porosity can be preserved; source rocks in the discharge of organic acids can be dissolved in the tuffaceous feldspar conglomerate , debris, tuffaceous fillings, such as the formation of carbonate cements secondary porosity.