Fractured Low Permeability Clastic Reservoir Engineering Optimization

Ordos basin is the second depositional basin and significant resource base in China. It is characteristic of widespread, mass oil-bearing stratum, great oil layer thickness and so on. Triassic Yanchang formation is the lowest permeability hydrocarbon reservoir assemblage. How accurate evaluating and efficient developing the lowest permeability petroleum pool is quite important effect for our petroleum industry's continuing and stable development in the future.Sanyan area had been scrolling explored and developed in the past years. Yanchang formation Chang2 bed, Chang6 bed were discovered in M oilfield, QingHuabian, QingPingchuan, ChuangKou, QiLicun. However, because it is in explored and developed early stage, reservoir evaluate only in explored phase, non-homogeneity characterization only limited in oilfield and series of stratus. For the lowest permeability, low pressure and high water-bearing oil layer's development are of experiment step. In water injecting process, portion well emerged east-west fracture water channeling, north-south lateral well difficult take effort. Therefore, along with explored area increasing and waterflood experiment going on. It is very necessary to reservoir accurate characterization and evaluation, building Yanchang formation delta front reservoir geology database and accurate geology model. Reservoir is accurate predicted and evaluated. Moreover, research the lowest permeability's filtrational mechanism and rule. Waterflood pilot area develop performance forecasting and evaluation, optimized development system, building delta's the lowest permeability, low pressure and high water-bearing oil layer waterflood developing technology policy, demarcation line and so on. Sanyan area Yanchang formation's the lowest permeability oil layer evaluate and high efficacy development settled down foundation. This article takes Sanyan area M oilfield Chang6 bed as an example, fracture type clastic rock the lowest permeability reservoir geology model and developing project research, the result is following. ①Reservoir accurate subdivide contrast and subdivide microfacies researchingCollecting 7exploration well coring data and whole producing well log information and make reservoir accurate subdivide contrast. Research area target bed is dividing for three subunits: 7sandstone layers; 17subzone which made reservoir accurate subdividing cope with waterflood development required. Based on petrographic description and regional sedimentary system analysis, we can go on subzone reservoir subdividing, building research area mode of deposition and log response, divide reservoir building structure and sandstone genetic type, sandstone longitudinal and plane made gradation statistical analysis ,building reservoir geology database.②reservoir accurate characteristic and building geology modelBased on reservoir petrology characteristic, diagenetic stage divide ,type and diagenetic pattern, reservoir physical property, porosity structure characteristic, comprehension evaluation and divide, potential sensibility; filtrational feature , filtrational unit divide. It is dividing into macroeconomic and microscopic. We can research reservoir non-homogeneous from this three angular; Interstrata,...