Study On Tight Oil Distributed Of Chang 7 In He Shui Area Of The Ordos Basin

The dense oil reservoir oil is short for dense oil Refers to the permeability is less than 0.1 × 10-3?m².Reservoir sandstone and limestone reservoir.After a short distance migration of oil, Oil is lighter, Single well there is no natural capacity or natural capacity below cut-off industrial capacity. Under certain economic conditions and technical measures of industrial oil output can be obtained.Chang 7oil reservoir belongs to the typical tight oil reservoir, it poor physical property and adjacent to the hydrocarbon source rocks.1.Chang7 is divided into three small layer The Chang 7₁?7₂ mainly for turbidite deposition, Sand body thickness is about 13 meters on average, 7₃ mainly deep lake sedimentary, sand body low-development.2.Chang7 porosity is 8.6%, permeability is 0.18 × 10^-3?m².Belongs to a dense reservoir. The relationship between porosity, permeability, are good correlation.Porosity permeability diagram shows that the permeability of reservoir is the bedrock of development degree of porosity and pore throat condition control.3.Combined with porosity, permeability, sand body thickness, expulsion pressure,median radius, such as mercury withdrawal coefficient correlation coefficient, From the perspective of reservoir physical properties on the whole Chang 7₁ property is better than 7₂ and From the point of reservoir classification, two layer ?, ?reservoir is less, mainly ?, ? reservoir.4.Hydrocarbon source rock evaluation, Chang7₁ organic carbon content is 3.4%,organic matter type for ? 2, effective hydrocarbon source rock thickness of 9.8m;Chang7₂ organic carbon is 4.2%, the types of organic matter is long ? 2, effective hydrocarbon source rock thickness of 10.2m; Chang7₃ organic carbon is 9.1%,organic matter type mainly ?1, effective thickness of hydrocarbon source rocks is on average 20m; Source intensity Chang 7₃ is significantly higher than the two layers,belongs to the good hydrocarbon source rocks, has the strong ability of oil source.5.Chang7 is first dense reservoir and Oil accumulation types, Oil mainly vertical migration, Lateral migration distance is short, Complex oil-water distribution, the differentiation is not obvious, without apparent oil-water interface, oil and gas areawidely distributed, Lithologic reservoir. Construction influence on accumulation is limited, In the following generation, Oil and gas in the upper storage ? Their own generation, Their own store. Distribution of oil and gas mainly by sand body distribution, the high quality reservoirs distribution and hydrocarbon of hydrocarbon source rock strength such three factors as control.6. According to above long 7 floors high quality reservoirs distribution and hydrocarbon generation intensity distribution and production test data to predict research district 7₁, 7₂ areas favorable for oil reservoir. Chang7₁ divided into XI17₁ wellblock west, XI75 wellblock and the 193 wellblock of these three favorable area.Chang7₂ divided into west, XI7?XI 41 and Ning7₃ well these three advantageous area.