Fine Evaluation Of The Xinglongtai Buried Hill Reservoir In The Liaohe Basin

Xinglongtai buried hill in Liaohe Basin,located in Panjin City,Liaoning Province,is a typical"uplift in the middle of the depression",which has very good conditions for hydrocarbon accumulation.However,there are problems such as large depth of reservoir,complex lithology and strong heterogeneity,and affected by geological and structural factors,reservoir distribution,oil and water area,reservoir physical properties and so on are changeable.In order to fully tap the geological potential and effectively promote the sustainable development of the reservoir,it is necessary to carry out comprehensive research on the reservoir of buried hill reservoir,analyze the development of reservoir fractures and establish a reliable reservoir geological model,so as to provide guidance for remaining oil research and remaining oil potential exploitation.Using modern seismic,logging and reservoir comprehensive analysis technique,through the analysis of the buried hill reservoir petrology characteristics of crack development situation,then using logging data to explain crack,research of reservoir physical parameters,the effective thickness of reservoir and division,using the related geological data for reservoir geological characteristics,contribute to the production status of reservoir reasonable evaluation.Focusing on the Xinggu 7-10 buried hill,Magu 1 buried hill and Magu 3 buried hill in the Xinglongtai buried hill belt,this paper analyzes the formation profile by using lithology,electrical property,seismic,experimental analysis and oil and gas test data,and classifying the strata by comparing the petro-electric combination characteristics and oil-bearing situation of the target strata.Using 3D seismic interpretation method,fine structural interpretation of the buried hill reservoir is carried out,revealing the development characteristics and structural morphology of the Xinglongtai buried hill reservoir,and studying the characteristics of the pore development between the volcanic tectonic fractures and broken grains.Through the analysis of the core data and the hydrogeological data,the geochemistry,lithology,reservoir space,reservoir physical property,reservoir temperature and pressure,reservoir space,distribution characteristics,etc.,for oil well production capacity,fluid properties,rock types,such as temperature pressure system is evaluated,the prediction of fracture structure,characteristics of trap are analyzed.Finally,through calculating the oil bearing area,effective thickness and other reserve parameters,the comprehensive evaluation of reserves is made,and the final understanding is as follows:(1)Based on 3D seismic data and data coordination,it can be seen that the Mesozoic conglomerate top structure of Xinggu Block 7-10 is an anticlinal structure controlled by two NE trending and two EW trending normal faults,which is influenced by the Archean buried hill basement paleogeomorphic structure.The block is divided into four fault blocks by four secondary faults,among which the highest point of the block is located near Xing82 Well in Xinggu Block 4 with a tectonic amplitude of 600 m.The strata near the high point of the anticline are relatively slow and the edge gradually steepens.Xingqi Block 9 in the north has a structural area of 2.59 km~2 and a tectonic amplitude of 400 m.The strata near the high point are relatively gentle and steepen toward the north.The Xing99 block in the west is a southward-dipping faulted nose structure,the highest point is located near Xing99 well,the buried depth of the highest point is 2310 m,the structural area is 1.59 km~2,and the structural amplitude is 200 m.The Xinggu 5 block in the south is the key potential area of this study.The whole area is a SW dipping faulted anticline with a tectonic amplitude of 400 m.The strata dip slowly in the EN direction and gradually steepen in the WS direction.(2)The use of multiple seismic attribute selection and resistivity inversion technique,single well effective thickness focused on glutenite segment in the upper,the inversion profile characterized by upper middle section of the continuous high value area,the effective thickness of single well focused on part,upper sporadic distribution,inversion profile is better than in the layered characteristics of part of the upper,single well effective thickness distribution in the upper glutenite segment,at the bottom of the development is poor,The inversion profile shows that the favorable reservoirs are relatively concentrated in the middle and upper part.The favorable reservoirs in the Mesozoic conglomerate segment are all developed in the block,and there are some differences in the lateral direction,and the favorable reservoirs are mainly concentrated in the middle and upper part of the conglomerate segment in the vertical direction.The favorable reservoirs in the middle part of the block are relatively thick,and tend to be thinner in the east and west sides and in the lower part of the structure.(3)Based on the analysis of oil test and production test data in the working area,combined with geochemical data,rock pyrolysis and gas chromatography data,the Mesozoic conglomerate reservoir in Block 7-10 of Xinggu is judged to be a pure reservoir with unlimited bottom water.The Mesozoic buried-hill reservoirs of Xinggu 7,Xinggu 9and Xinggu 7-10 belong to massive bottom-water fractured buried-hill reservoirs.Reservoir types in Block 1 and Block 3 are stratified fractured massive bottom water reservoirs,and oil test confirms that the oil-water interface is also-4670 m.(4)By delineating oil area,divided into reservoir effective thickness,statistical regression of core to calculate effective porosity and oil saturation in calculation of reserves required parameters,obtained the Xinglongtai buried hill reservoir Xinggu reservoir and Magu reservoir storage of the reservoir distribution,calculated the geological reserves,thus more accurate support for oil and gas development.In this paper,according to the actual situation,the favorable blocks and production trend of the reservoir are accurately predicted,and the geological characteristics of the buried hill reservoir are accurately grasped,so as to provide support for future oil and gas field development more accurately.By studying the characteristics of Xinglongtai buried-hill reservoir,the reservoir characteristics,structural characteristics and reservoir distribution can be defined,and the basis for reserve declaration and reservoir development of Xinglongtai buried-hill reservoir can be provided.