The Prediction Of Sweet Spot In Middle Cretaceous Shale Oil In UAE BH Block

As a major member of OPEC and an important country along the route of "One Belt And One Road",the uae is rich in oil and gas resources and has considerable influence on the international oil and gas market.In 2012,ABU dhabi national oil company of the united Arab emirates(UAE)became the main partner of CNPC in uae oil and gas cooperation.It has laid a solid foundation for the exploration,development,storage,transportation,sales,engineering and equipment of the upstream block of the uae.The development of the oil industry has gone through three stages: conventional oil and gas,conventional oil and gas co-exploitation,and unconventional oil and gas development.In the late 20 th century,the "continuous accumulation of oil and gas" proposed by Schmoker et al.,provided a plan for unconventional oil and gas development.Unconventional oil and gas,in the broad sense refers to the traditional oil and gas mining technology under the background of unable to get has economic value of industrial output,the need to develop new technology to improve the reservoir in order to obtain the economic value of oil and gas resources,including shale oil and gas,oil shale,oil asphalt,dense volcanic rock oil and gas,oil and gas,coal-bed methane,carbonate seam hole gas,natural gas hydrate,etc.Most of this unconventional oil and gas is stored in source rock.Shale oil in unconventional oil and gas refers to the liquid hydrocarbons that occur in the effective source rock mudstone in the free,dissolved or adsorbed state.It is the accumulation of oil and gas after the generation and expulsion of hydrocarbon in the shale rock,and it has basically not undergone long-distance migration.In other words,it has only carried out short-term primary migration in the source rock,i.e.,self-gene ration and self-storage.Present LY,there is no definite definition of "shale oil" at home and abroad,and the control factors and evaluation of shale oil reservoir are still in the preliminary stage.Shale oil has its own characteristics: first,compared with conventional oil and gas,it is not controlled by obvious traps;Secondly,shale oil reservoirs generally have the physical property characteristics of low porosity and low permeability in space,but shale containing oil and gas often has the characteristics of high porosity,high permeability and high yield in local space.Therefore,we need to break through and update the understanding and prediction method of "dessert" in time.FWR,mud logging,core data and logging data are used to identify sequence boundary(SB)and MFS in this paper first.Next,the well profile is established to correlate the sequence boundary of the formation,SB and MFS.Then,the seismic profile was used to find the features of unconformity surface,upper superplane andlower superplane to re-confirm the SQ and MFC surfaces.Finally,these data are analyzed comprehensively to establish the stratigraphic framework.And then summarizes the predecessors' research on the basic concept of shale oil,thoughts and basic methods,give priority to with the TOCforecast,some geological factors of shale oil,such as TOC,cracks and brittle forecasting method is studied and is improved and applied in the related aspects,Such as: single factor method for natural gamma,compensated density log method,Passey algorithm,GR-? t intersection analysis,multiple parameters regression method and elastic parameters,such as relationship equation between TOC analysis and improvement.Then,the elastic attribute body was created by simultaneous inversion before stack,and the relation between the content of the well surface TOC and the elastic model was used to predict the whole TOC data body.One-dimensional and three-dimensional porosity pressure analysis models are established using well data.The grid model of young's modulus and poisson's ratio was established to analyze the horizontal stress of the target layer.Finally,combined with shale thickness,porosity,brittleness and fracture,the final position of "sweet spot" is roughly predicted,which provides some reference for future exploration and development.