Northeast Sichuan carbonate reservoir log information processing and interpretation method
|School||Southwest Petroleum University|
|Course||Oil and gas measurement and control engineering|
|Keywords||northeast Sichuan carbonate rocks parameter model four natural relationship fluid properties|
In recent years,we obtained more and more profiles from the carbonate rocks of oil and gas reserves,which have aroused great attention of oil workers.Particularly,in the exploration of carbonate reservoirs, we made a series of penetration in eastern Sichuan Basin,they show huge exploration in potential in the northeast Sichuan oil and gas carbonate reservoir,and the Permian-Triassic become the current hot spots.The oil and gas carbonate reservoir in the northeast Sichuan have strong heterogeneity,pore type,fracture and crack-pass,they have complex uniform random distribution of pore space, the reservoir matrix porosity is low and the strong to the opposition.The pore structure and the rock matrix affecte the resistivity measurement seriously,they reflect the nature of pore fluid information weakly.The cracks drilling penetrated deeply cause it is difficult to identify the properties of reservoir fluid.The complicated components of the rock and the lower porosity in reservoir parameters both affect the accurate calculation, so that it is difficult to classify and evaluate the reservoir degree.In order to resolve this problem,based on collecting and analyzing the data of the well logging,geology,core sample,well testing and producing test.This article focus on develop supporting method and technology as follow:(1) The logging data preprocessing,including:depth correction,filtering processing and standar dization.(2) Fully use the technique of histogram and cross plot,and combine with the characteristics of Northeast Sichuan carbonate gas reservoir, the author establish the reservoir parameters model such as clay content,porosity,cracks,permeability,gas saturation and so on.(3) Based on coring,testing and trial mining and logging data,the author conduct the lithology and physical properties,electrical properties and the relationship between gas-bearing research.in the last, it analysis the logging response characteristics, for example: gas,gas and water with the same layer,and water layer in working area,it also carries out the oil reservoir’s lower limit of the lithology.(4) The resistivity logging method,the ratio of longitudinal wave velocity and transverse wave velocity method and resistivity-porosity crossplot method are combined to identification fluid properties.