Identification Of Fluid Properties Of Carbonate Rocks In Mingyuexia, Eastern

Mingyuexia structure is located in central eastern Sichuan steep structures in Sichuan Basin, where Chuandong Carboniferous gas reservoirs are widely distributed. Due to the nearly10years’transformation of exploration investment, less new reserves Carboniferous were found, Mingyuexia structure as one of five new structure with a low degree of exploration, is the focus of current exploration. Reservoir understanding of the "four character" are to be solved, including a discussion of the formation fluid properties as a top priority. In this paper, we analyzed the typical drilling, logging data and core data of the work area, focusing on the study of logging identification of fluid properties in Mingyuexia structure in East Sichuan Carboniferous carbonate rock reservoir.Coincidence rate of formation fluid characteristics are too low to increase Regional drilling risk and affect yield countermeasures lately. In this paper, for the identification of reservoir fluid properties, mainly in the following five aspects of research:①ientified lithology by CRA integrated application method, cross-plot and gray relational analysis;②Researched on logging characteristics and reservoir classification of reservoir Carbonate void;③Built Reservoir parameters log interpretation model;④Established of reservoir parameters identification chart interpretation models based on integration study of reservoir fluid properties in conventional logging data and Carboniferous gas reservoir identification technology;⑤identified the gas reservoir by logging two multi-parameter vector discriminant analysis with typical wells in research area. And achieved the following research results and cognitions:(1)Lithology identification is the basis for identifying the characteristics of the fluid, is also one of main factors of gas-bearing reservoirs. Summarized the main formation lithology M, N values and other vary discipline of Logging features parameters. Applied based on the volume of rock physics model CRA law, the cross-plot and gray relational analysis to recognize lithology point by point and layer automatically in the work area. Studies indicate that cross-plot and gray relational analysis for work area lithology with good results.(2)Complex group of primary pore and secondary pore makes carbonate rock’s reservoir type complicated. Based on The study of logging features carbonate rock’s pore structure, combined the analysis of the working area’s static data, divided the reservoir of Mingyuexia structure’s carbonate rock into three type:pore type, fracture-pore type, fracture type and choose some parts of well to divide reservoir type.(3)Based on a systematic understanding of the work area of geological structure, lithology and physical properties, optimized reservoir parameter calculation model by core analysis data for scale; According to the work area of Carboniferous porosity, permeability lower and upper limit of reservoir clay content, classified to good, moderate and poor of reservoir, and made statistics and analysis for it. The study found Carboniferous reservoir properties with pore mainly is good reservoir thickness accounted for nearly half of all, it have an impact on the production. (4)Combined with results of the reservoir Classification, used existing gas test conclusions typical gas reservoir, gas and water and aqueous layers segment fully, explored and established a suitable of intersection plate resistivity, It includes ratio of deep and shallow resistivity and deep resistivity, deep resistivity and porosity and porosity and saturation in Mingyuexia structure. Extracted characteristic parameters of the high-resolution(three porosity ratio POR3、the ratio of difference in the resistivity△R、lithology coefficients△GR and formation water parameters Sw/Rwa), used two vector discriminant analysis to identify formation fluid properties and the rate of back judgment is high, therefore, utilize testing, production performance and other information to verify.Based on the research of key technical issues of identify lithology, reservoir division, reservoir parameter calculation, fluid characteristics of discrimination and so on, Formed the methods and techniques that open hole wireline logging (static) identified fluid characteristics of carbonate rocks of Carboniferous reservoir in work area and got a good results in practical applications, it provides the basis and technical support for late perforation, gas test and other operations of work area.