Researches and Application of Caprock Logging Evaluation Method
|School||Southwest Petroleum Institute|
|Course||Earth Exploration and Information Technology|
|Keywords||Caprock of oil and gas Sealing mechanism Log facies analysis Multi-mineral model Evaluation parameters and standards Grey Correlation Method Reservoir-seal assemblage Interpretation and evaluation|
High-quality, good caprock reservoir save hydrocarbon essential conditions. Logging data to carry out a comprehensive evaluation of caprock is the key to the study of the law of oil and gas migration and accurate interpretation of oil and gas layers. In this paper, the research projects in the actual production caprock evaluation carried out a lot of in-depth research on the use of the logging data. The studies suggest that the angle from log facies analysis can solve the problem of the single well strata at caprock division lithology identification. Visual automatic hierarchical value problem based on mathematical statistics - extreme value variance clustering method \The program also provides a new logging phase analysis method can get more accurate and intuitive logging sectional reliable lithological stratification based on looking for and evaluation of oil and gas caprock, at the same time to make up for the cost of drilling coring high and logging debris describe the the error defect depth. Important parameters, such as the caprock thickness (H), porosity (Φ), the permeability (K) can be extracted from the logging data quantitative evaluation caprock performance is good or bad, the breakthrough pressure (PA) and the remaining pressure (ΔP) etc., the study found that PA with the Φ t the Φ e , K, V sd increases exponentially decay which Φ e Φ t large impact on the PA. Caprock the macroeconomic spread, microscopic sealing mechanism, the use of gray correlation method to deal with these evaluation parameters, establish a reasonable caprock criteria. According to the the caprock logging response characteristics, divided into the caprock shale caprock, physical properties the caprock and calcium caprock three categories. I focus on the evaluation of shaly caprock study crossplot method and NMR logging porosity curve overlapping of the the dense sandstone cap YN2 wells reservoir-cap combination of comprehensive evaluation analysis, to find exactly The three sets of reservoir-seal assemblage. Quantitative evaluation of the research wellblock caprock various logging parameters and evaluation methods, found in log interpretation analytical point of view of technology, the introduction of combination of reservoir and seal correctly divide the oil, gas, water layer, is conducive to seeking development value of oil and gas reservoirs. Compiled a set of the caprock logging evaluation application Forward platform, combined with the actual situation of the research well area of ??the range of methods based on Fortran and VB language, will be used to study well, reservoir and cap combination integrated The evaluation successfully handled nearly 10 wells, and to the evaluation of the effect is expected to.