Research On The Reservoir-forming Regularity Of Putaohua Oil Layer Of Gulongnan Area In Songliao Basin

Songliao basin is a nonmarine petroliferous basin which is rich in oil and gas, with the deepening of the oil and gas field exploration and development, the difficulty of exploring and developing the objects is increasing year by year,high-water ratio increased rapidly, difficulty of exploitation is increasing.Gulongnan zone as one of the most important oil-producing block in Song Liao Basin, in order to explore and develop this area better,associating with previous study,by using the full and accurate core, seismic, logging and drilling data from Putaohua layer’s of Gulongnan area,I have a fine study on the structural characteristics sedimentary evolution, source control and accumulation pattern of the Gulongnan area, I summarized the oil and gas enrichment regulation, certified the favorable oil and gas accumulation zones.Through research and analysis and indicates that, the concave convex structure pattern of the study area formed in the late period of Mingshui formation, the main deformationperiod of fault is the depositional stage of Qing Shankou formation to Nen Jiang formation,I proposed for the first time that the Mao Xing three-dimension district develop the oil source polygonal fault,supplying a sufficient vertical migrating channel to oil or gas in the vertical direction.As my study area, Putaohualayer is mainly under the control of north and northwest provenance, the main provenance is the northern provenance, main sand body is underwater distributary deposits channel, estuary dam and sheet sand, the thickness distribution of sand body on the surface is not well-distributed, emerging the trend of thick in the northwest,thin in the southeast.The bottom of the Putaohualayer(abbreviation as the P) and top of P has a thin sand body, as well as a small range of distribution, the middle of P has a thick sand body, and its range of distribution is wide;There exist 5 types of vertical distribution of oil and water in the study area,that is pure oil type、up-oil down-water type, oil-water layer type,pure water type, mixed type.The oil is mainly distributed in PⅠ1-PⅠ6 layer;The study area has totally counted as 7 types of oil and gas reservoirs, mainly are the structural reservoir,fault lithologic reservoir, structural lithologic reservoir, sand lens reservoir(lithological pools and sandstone updip pinchout reservoir,Via analyzing the reservoir and the main controlling factors,I certified XinZhanxi, ZhaoXi, ZhaoNan slope zone are mainly dominated by fault-sand matching,AoNanbi’s nearby slope area,the enrichment of the sand body is the main controlling factors of reservoirs.Considering the aspects from structure、sedimentary、reservoir,I have predicted the favorable areas in the blank area of the developed area for themoment, submitted a suggestion wells position counted as 4, pointed out the right direction for the Putaohualayer of Gulongnan district in the next stage of increasing of the production.