The Technique And Application Of The Old-Well Countercheck In Fu Long Quan Gas Field

The main research target of the item is to countercheck the existing data of recording well,logging well,testing oil and engineering circumstance of boreholes. By this, study"Four Properties"relationship of the reservoir, look for counterchecking and evaluating method to the old well, which adapt to characteristics of the reservoir. In order to review the old wells in the multi-well logging data contrast a more reasonable interpretation, combined with the structural characteristics of the region and the characteristics of the deposition phase, the Fu Longquan Construction on the 40 wells in detail the stratigraphic correlation. Established a system of the geological data stratified table.Combination of Fu Longquan structure characteristics of the development, according to the End of the deep-well drilling, we have fineshed preparation of the shallow-, medium-deep layer of the three grades of gas reservoir section.Through the distribution of the gas reservoir analysis, we can see the distribution of the Fu Longquan gas field clear. Gas concentration in the parts of the high anticline structure, and by the control of the lithology changes, north and north-east to north-south fault play the role of closed block. As a result, the main gas reservoir by the anticline fault and lithology, as well as the common control of the gas reservoir rock structure. On the horizontal strong Comparability gas group, has a certain distribution area. On the vertical distribution of oil in the Quantou group to Huoshiling group, the distribution of well above long. By analyzing increase the awareness further more of Fu longquan area of the oil and gas reservoir characteristics , for the future of Fu longquan of the gas field exploration and development has laid a good foundation.In order to facilitate the study of the reservoir"Four Properties"relationship to the next step of research, log on to do a deal with standardization. The use of standardized approach is: First of all choosing one or more standard wells, using core analysis data, the use of cross-mapping technology to the core porosity curves scale, correct the log curves of the standard well. Through the strata contrasting between adjacent wells, selecting the stable deposition layer, well log in response being strong comparable as the standardization of the above paragraph contrast well. Histogram technique used to determine the correct amount of log, and calibrate all the curves of the acoustic, neutron, density and gamma of all wells of the area. And finish the drift correction of SP curves of all wells in the reserched area. To use multiple technologies to identificate oil layers and gas layers, recognition of these are:1, pattern recognition method: As the gas is of special physical and chemical properties and its response on the logging characteristics, according to the neutron - density, neutron - acoustic and resistivity - acoustic logging overlapping graphics, visual identify sandstone gas layer, and determine the fluid characterization of reservoir.2, conductive pore model of process technology: Most based on the analysis of fluid conductivity ,calculation the reservoir conductive pore size and overlap the total formation pore, identify the fluid nature of the reservoir. Throughout the process, taking into account the continental deposit in the process of land-based sources of material composition, micro-phase deposition of the general conditions throughout the sediment are in fact profile, that is pure sandstone and mudstone share of absolute purity of a relatively small proportion of all , And accounted for basically the main sand shale and sandstone soil. Therefore, the handled rules requested is by the porosity of the total calculation of the curve with the electrical conductivity of the porous shale in the so-called paragraph coincidence, the water level of coincidence. Actual results is, in addition to individual well above shale out massive introduction of high, vertical profile of both the mudstone, the coincidence of water to ensure the reliability of the results of the second.It is worth mentioning in passing that the conductive pore model of the process of actually logging porosity own system error, resistivity logging system error has been amended. Error because they cover the whole well, and focus on their own to deal with mud and water coincidence, the search for sandstone in the non-coincidence, therefore, is both practical system to make up for an error.3, fluid direction method: This is a conductive pore model to further deepen the process technology. In the research on "Four Properties" , fluid direction indicators in the region Fu longquan a clear division of oil, gas and water boundaries value.4, fluid acoustic impedance ratio method: By calculating the acoustic impedance ratio of main reservoir fluid mixed with of gas identify the gas layer.5, double pore structure model processing technology: Individual wells fractured formation, in view of its special characteristics of the lithology of the logging in response to some well above the "double pore structure" model to deal with, the result is better.6, the thin-layer technology dealing with: Using thin layer of software to deal with some of the wells had to deal with further helped to identify the nature of the fluid reservoir.7, saturation difference method: Calculation of reservoir water saturation and bound water saturation of the margin, to determine the possibility of producing water of reservoir. On the basis of the calculation of water saturation, by SP and natural gamma two ways to calculate the value of particle size, and then through the median grain size and porosity calculated irreducible water saturation, the use of water saturation and water saturation the difference, to determine movable water content.8, the Composite Index judge method: By calculating the formation of the reservoir identification index, the gas identification index, the pay layer identification index and the index based on a variety of capabilities to identify gas reservoirs weighted Composite Index judge can accurately identify the level of oil and gas.By above technique of oil ang gas identification develop old well countercheck of this area. Put forward the hopeful test layer. And now we have acquired new discovering oil or gas stratum and discovering well. This area geology reserves have been increased.On counterchecking the originality record well data of Fu Longquan area, we recover and build up rock section of the originality record well, carry on the statistic to the special rock basaltic well segment. Built up the systemic geology layering data, drew up the cross well section, perceive vertical and horizontal variety regulation of everyplace layer a segment in Fu Longquan gas field through the geologic strata contrast. Drew up the well body structure diagram, provided the perfect foundation data for the follow-up construction of the old well through well tube circumstance countercheck. Establish the foundation for the area's"Four Properties"s research and oil or gas identification through the standardize processing elaborately to the logging curves to the Fu Longquan gas field of GR, AC, CNL, DEN, SP etc. On the"Four Properties"s research built up each segment identification plate among oil, gas and water. To reinterpret through adopting 8 kinds of pertinent technique of the oil and gas identification to Fu Longquan gas field, raise the interpretation Correctness. The old well countercheck, put forward to test the well, layer of the oil suggestion lately, and passed the testing verification, provided the credibility for containing gas property of Fu Longquan gas field.