Fine Geologic Reservior Model Of The 1st And 2nd Member Of Funing Formation In Zhuang2 Faulted Block Of Jiangsu Oilfield

Fine geologic research can guide program regulation and excavating work, it has very important meaning. Using reservior geology, analytical hierarchy process, and other methods and theories, the formation is subdivided and correlated finely. The type and character of micro-structure, and the relation between combinational style of micro-structure and oil well production is analysed. The reservior architecture, distribution character of porosity and permeability in machine direction, plane, and each microfacies, is researched. The heterogeneous reservior model is established, and affecting factors are studyed, and the relation between reservior heterogeneity and the distribution of remaing oil is researched too. The following researching results and cognition are acquired mainly.(1) The formation is subdivided and correlated systematically, and the boundary of the sandstone series is regulated.(2) The type of micro-structure is small faulted structural nose, small terrace, and small twist. The combinational style of micro-structure is bi-convex, convex up and plain down, and bi-plain.For the oil well in the combinational style of bi-convex, and convex up and plain down, the integrating ratio to oil and water of it is great, the rate of containing water is low, the condition of production is well.(3) There is delta front intrafacies in Fu1 Member, and it is subdivided to frontal sand sheet, mouth bar, distributary channel underwater, bay between distributary channels underwater. There is offshore -shallow lacustrine intrafacies in Fu2 Member, and organic beach, oolitic beach, calcareous beach, sandy bar in shallow lake, and mud in offshore–shallow lake are subdivided from it. The nature of containing oil of organic beach and oolitic beach is better, and the digging potential of organic beach is greater.(4) There are 25 kinds of lithofacies, 9 kinds of architecture elements are identified in the 1st and 2nd member of Funing Formation. In three-dimensional space, the sand body presents connection of multilayer. The combination model of architecture elements is divided into structure model of thousand-layer pancake and matching.(5) The permeability of distributary channel underwater sand presents distribution model of positive rhythm, and porosity does distribution model of uniform rhythm, and the nature of containing oil does distribution model of positive rhythm. The permeability of mouth bar sand presents distribution model of opposite rhythm, and porosity does distribution model of opposite -uniform rhythm, and the nature of containing oil does distribution model of uniform rhythm. The permeability and porosity of mouth bar sand is the maximal, those of distributary channel underwater sand and sandy bar sand is smaller a little, the nature of containing oil of sandy bar sand is the maximal. The permeability, porosity, and nature of containing oil of bay between distributary channels underwater and frontal sand sheet sand is the worst.(6) Compaction, cementation, alternation, dissolution, and denudation mainly consists of diagenesis. The pore of conglomerate is the pore mainly between granule, and the pore inside granule and the pore as fracture is secondary. Megalospore and throat, and other 4 type of pore structure in microscope are generalized. The number and scale of interbed in every sublayer is small relatively. Interlayer heterogeneity presents middle to strong degree, and barrier bed develops well relatively in the whole area. Plane heterogeneity presents middle degree. Reservoir heterogeneity is affected by sedimentary microfacies, lithogenesis, and long-term waterflood. Remaining oil mainly distributes in the area that presents herterogeneit?? weak level.