| The oil and gas exploration area of Binchang block in Ordos Basin is3011.8km2,and the main oil-bearing layer is Chang8,Chang7 and Chang6,and has nearly one hundred wells.Two-dimensional seismic exploration area is 1662.32 km,and three-dimensional one is 837.483km2.At present,industrial oil has been found in Member Chang 6 and Chang 7.However,the overall exploration and development level is low,and it has not yet formed a large-scale reserves and a development area.The Chang 6 and Chang 7 reservoirs of the Binchang block are mainly located in the transitional area of the foreland and shallow-semi-deep lake facies of the lake facies.Although the sand body development area is wide,the sand bodies of different periods and different formation mechanisms have huge number of difference.The reservoirs of Chang 6 and Chang 7 are unconventional reservoirs with low porosity,low permeability and high density,which are affected by many factors such as reservoir heterogeneity.In different reservoirs,Physical properties,porosity characteristics and logging electrical characteristics are much different.The relatively high permeability "dessert" reservoirs under the background of low porosity and low permeability are the main problems in Binchang block.The oil-water relationship in oil layer group Member Chang 6 and Chang 7 is complex and the reservoir interpretation rate is low and the yield of the test oil is poor.In general,the reservoirs in the Chang 6 and Chang 7reservoirs are dense and the pore structure is complex and the fractures are developed,The types of reservoirs are diverse,the nature and complexity of the fluid are complex,the types of reservoirs are varied,the capacity difference is large,the inefficient reservoirs are high,the productivity of the wells is decreasing rapidly and the stable production is difficult.But the overall oil layer sand body development,reservoir oil content of Member Chang 6 and Chang 7 of Binchang block are good,with large amount of oil and gas resources,a broad exploration and development prospects.Therefore,carrying out fine division of reservoirs and research on the relationship of reservoir’s four properties,And the reservoirs are quantitatively evaluated.The reservoir is favorable for the reservoir area.The reservoir is favorable for the reservoir area.It is a low porosity,low permeability,low abundance and low yield oil Tibet exploration and development to provide a technical support,is to achieve Binchang block to extend the oil section of the further breakthroughs and the rapid increase in production on the top priority.Based on the previous studies,this paper makes full use of the drilling,logging,logging and drilling of the Binchang block,which is based on the regional geological background,regional tectonic evolution,block exploration and development of the North China Craton Basin.And the stratigraphic division and comparison of the strata of Chang 6,Chang 7 and Chang 8 of Binchang block were carried out by comparing the thickness variation characteristics,stratigraphic unit sedimentation cycle and electrical characteristics.According to the study of the existing sedimentary facies,through the observation of the core and the analysis of the thin slices,the combination of outcrop information and the outcrop data and the outcrop analysis of the stratigraphic division and the stratigraphic division,The logging characteristics,the structural characteristics,the grain sequence characteristics,the section structure and the logging characteristics of the main sand bodies of Chang 6 and Chang 7 are summarized.Based on the study,the sedimentary microfacies of Chang 6 and Chang 7 sections of single well are studied in combination with logging curve.At the same time,combined with the research results and regional sedimentary background of Binchang block,the sedimentary microfacies are divided and identified.The characteristics of lithology,sedimentary characteristics,section structure and logging characteristics of each reservoir group are studied,and the characteristics of reservoir rocks,pore characteristics,physical properties and reservoir pore structure are emphasized.The characteristics of the deposition and other aspects of the study,combined with thin film observation,pressure mercury curve and description of the Binzhuang block matrix pore development factors were analyzed,the effective reservoir identification and classification,the Bin long blockChang6 and long The results show that the electrical characteristics and oil-bearing characteristics of typical wells are based on the study of four types of reservoirs,such as reservoir lithology,physical properties,electrical properties and oil-bearing properties.The relationship between the physical properties of the reservoir and the petrological parameters such as particle size,composition and heterogeneous content is studied.The reservoir properties of different genesis are studied,and the characteristics of reservoirs,basing on the analysis of reservoir development controlling factors,according to the sedimentary facies,sand body thickness,reservoir type and so on,the diagenetic evolution path of different genesis sand bodies and the diagenesis intensity are studied.The characteristics and properties of reservoirs with different production capacity are studied.The reservoir physical properties are studied according to the production capacity.The reservoirs are classified and evaluated accordingly.On the basis of reservoir evaluation criteria and the comprehensive evaluation of the reservoirs of Chang 7,the favorable reservoir facies ofChang 6 and Chang 7 reservoirs in Binchang block are predicted and optimized.The results are as follows:(1)Based on the data of nearly 100 wells that have been completed in Binchang block,the stratification of the nearly 100 wells of the Binchang block is re-compared by using the sedimentation cycle combined with the thickness gradient principle.The target layer Chang 6 is redivided into Chang 61,Chang 62 and Chang 63 three layers,the Chang 7 is redivided into Chang 71,Chang 72 and Chang 73 three layers,the Chang 8 is redivided into Chang 81 and Chang 82 two layers.(2)The main deposits of the Binchang block are mainly composed of sandy debris flow and the turbid flow,and the single-stage distribution area of the debris flow sand body is small,but the thickness is large and the development period is frequent.It always results in forming a thick layer of sandston as main sand body of Chang 6 and Chang7.According to the characteristics of mercury intrusion,thin film observation,reservoir physical properties,pore characteristics and pore structure,two effective reservoirs of Chang 6 and Chang 7 were identified.(4)Based on the study of reservoir lithology,physical property,electrical property and oility,this paper studies the reservoir evaluation with the control factors of high quality reservoir development.Based on the reservoir evaluation and the selection of this standard,And the second is the favorable reservoir area of the two types of oil and gas,one of which is the block with large thickness and contiguous development of the sand body,and the other is the block where the thickness of the sand body is small and the local crack develops. |
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