Study On Sedimentary Characteristic And Reservoiring Pattern In Heidimiao Oil Layer In Daan Area Along The River

This study uses detailed well core, well drilling, and well logging etc data in the studyarea and taking sequence stratigraphy and theory of sedimentology as guidance, with theidentification of logging curve feature, method of stratigraphic fine division and correlation ispresented which is fit to meandering river delta. It is a method that correlation of base levelcycles interfaces are come near under the control of gradual marker chronohorizon. By themethod, Heidimiao oil layer of Da'an area is divided into thirteen sedimentary time unitestablished the uniform and fine stratigraphic framework. Within the regional sedimeniologytheories and detrital heavy-mineral analysis of the basin to find out the sedimentary sourcearea in the study area. The study area is presented which is influenced by the northwestYingtai water system and the northeast branching river system of north water system, andsedimentary source from north water system mainly deposition in Daanbei oilfield, Da'anoilfield and Xin-zhan oilfield while northeast source in Nanshanwan oilfield. The finesequence stratigraphic framework and source of sediments analyzed, the delta frontsub-facies and prodelta sub-facies of Heidimiao oil layer is presented which overall isnorth-south trending,only Nanshanwan oil field showing the northeast-southwest spread. It isrealized that underwater channel and debouch bar sandbodies are sand body framework, theyare mainly reservoir sandbodies of Heidimiao oil layer.Based on established stratigraphic framework, sources of sediments and spatialdistribution of single sandbody, taking full use of petroleum accumulation system and othernew ideas of modern oil and gas geology, and applying the technology of comprehensiveanalysis of accumulation region, a single sand body oil control modem analysis. Through theanalysis of discovered reservoir types and distribution system, mainly identifying lithologic,fault-lithologic reservoirs types, and analysis them in detail.Based on all the conclusions above, it is predicted that favorable hydrocarbonaccumulation zones are the axis of Da'an nose structure and adjacent concave flank and theslope of Nanshanwan, and based on this the author points out fifteen favorable traps andmakes recommendation that ten wells should be located.