The Three Section Of Paleogene Funing Formation Reservoir Description Of Qintong Sag Of Subei Basin

Qintong sag of oil and gas exploration began in 1958, long-term borne by sinopec east China branch of oil and gas exploration and development work, but the geological characteristics of oil and gas water distribution relation are very complicated, the distribution rule of the favorable reservoir know very little.The reservoir because of multiphase tectonic activity, resulting in the sag development multiphase fracture system, especially the development level of various fault fault zone in different age intertwined, cause is segmented into many small fault block oil field, and the fault block oil gas is different,This paper combines the qintong sag of the exploration and development of the existing research results and understanding, by conducting Yu Duo – Hua Zhuang area reservoir distribution characteristics and fine geological modeling research, further know Yu Duo – Hua Zhuang area regional configuration of time and space relation of the spatial distribution characteristics of reservoir, and then to geological modeling, the main achievements and experiences has the following several points.(1)The three sections of Fu Ning formation is divided into four oil group of 20 27 single sand body in small layers of oil group of thickness of sand body, good connectivity; Oil group of each single sand body thickness of medium; Oil group of each single sand body is thinner, mainly distributed in Yu Duo and Ye Dian area sediment source mainly comes from the north direction Three sections of oil group is given priority to with delta front, fukang sedimentary microfacies are mainly underwater distributary channel Channel lateral margin estuary dam bay between distributary bar, etc(2) Slopes development in the two groups: a group for the control of sag of sedimentary and tectonic development and evolution tendency of the eastern boundary fault zone in the north west fault rupture north east to arc distribution on the whole, partial sigmoid, with concave line; Another group of concave slope belt faults, their plane extension distance is relatively short, fracture to the north east- north east to distribution with two groups of faults to and construct the contour to a certain point of view, the formation of fault block traps(3) Yu Duo – Hua dian region is given priority to with normal delta front subfacies deposition, the main development of the underwater distributary channel Mouth bar far bar and sheet sand microfacies oil to oil group performance for two full into depositional cycle oil oil group is given priority to with shallow deposition, underwater distributary channel Mouth bar sand sheet to compare development; Oil group is given priority to with sand sheet sedimentary, oil group predelta mud deposits in the deep(4) Yu Duo、Ye Dian and Hua Zhuang areas within the target zone, Ye Dian and Yu Duo regional mudstone wave impedance value in 6100-8000g/cm~3.m/s or so, generally sandstone wave impedance value in 8200-12000g/cm~3.m/s. Hua Zhuang regional mudstone wave impedance value in 5500-7000 g/cm~3.m/s or so, generally sandstone wave impedance value in 7000-10000 g/cm~3.m/s. Wave impedance is greater than the mudstone and sandstone can distinguish by wave impedance inversion sand mudstone(5) The three sections of Fu Ning Formation and there are some differences on the resistivity of surrounding rock, through the resistivity can be generally divided into oil sands interval Yu Duo- Ye Dian areas resistivity value to 5?.m is bounded, Hua Zhuang areas resistivity value by a 4?.m(6) The porosity of the three sections of Fu Ning formation distribution between 6% ~ 18%, the average is about 12%, permeability distribution between 0.5 ~ 10-2010-3μm2, an average of about 7 to 10-3μm2, overall performance for low porosity low permeability reservoir. Yu Duo area 1-1 4 6 4 single crib region, 5 4-1-1 of 4 Ye Dian area 6 7 monolayer and Hua Zhuang area 3 4 6 7 4-1 single sand body relatively high porosity, permeability, oil bearing area is large, for the advantages in the study area reservoir and oil-bearing horizon, oily areas are mainly distributed in the Yu2-2~Yu2-3、Yu2~Yu2-5~Yu2-6、Yu3~Yu3-3~Yu3-4 of Yu Duo area and Su289、Ye5b、Su256~Ye3 of Ye Dian area and Hua2~Xie 1 of Hua2、Cao2、Hua3~Hua3-2~Hua3-1~Hua3-3.