| Development appraisement of gas field and scientific production of water-driven gas reservoir, as an indispensable measurement to gas reservoir development, are popular and effective methods to improve gas reservoir development result. In the dissertation, based on comprehensive summation of development result of Carboniferous gas reservoir in Puxi gas field, such production and water-management measurements are put forth and main research contents are below:1.Study on geological structure. Based on the original seismic reflection structure map. the map is modified by use of new drillings data.2.Stratigraphic classification and correlation. Such work is based on lithology and well logging data of three wells.3.Research on reservoir characteristics. According to physical and mercury-driven data of Carboniferous gas reservoir in Puxi gas field, the reservoir characteristics are comprehensively analysized and the lower-limit value of efficient porosity is tested.4.Analysis and emendation of effective reservoir height in each well. According to lower-limit value of efficient porosity, statistic work on all kinds of reservoirs physical parameters is done and core porosity and efficient height are revised.5.Research on gas-water contact. By integrative use of static and dynamic data of gas reservoir, the three methods such as well logging, core and conversion pressure coefficient are used to gas-water contact of the gas reservoir.6.Establishment on gas reservoir geological model.7.Check on gas-in-place. Base on geological structure and reservoir features, the gas reservoir is divided into gas area and gas-water transition area and the volume method is applied to check gas-in-place.8.Research on dynamic performances of gas reservoir, estimation of water inflow and analysis on water-management measurements.9 Interpretation and analysis on well test data of the Puxi-1 well.10.Analysis on gas well productivity.11 .Work out dynamic prediction plan on gas reservoir and predict dynamic performance indexes by use of the gas reservoir numerical simulation technology.12.Contrast the technology indexes of all kinds of development plans.Through the above-mentioned research of various aspects, the main achievements are described in the following:l.On the basics of the old structural map of seismic reflection, the bottom-surface structural map of lower parts of Puxi Perimian in Sichuan Basin was designed again.2.Carboniferous formation can be divided to three segments, C2hl3, C2h12 and C2hl1. The stratigraphic correlation figure of Carboniferous reservoir in Puxi was plotted. The distribution of Carboniferous formation in Puxi is comparatively stable.3.The low limit of the effective formation porosity is verified thoroughly: porosity is great that or equal to 3%, the reservoir is classified by three grades, they are I(porosity great than or equal to 12%), II (porosity great than or equal to 6% and little than 12% ), III (porosity great than or equal to 3% and little than 6% ).4.The statistics results of formation thickness of individual wells show that the 3ed formation is in the majority of of Carboniferous formation in Puxi.5.The gas-water contact is -3770m, and the gas-bearing area is 6.71 km2.6.The area of volumetric method reserves verification is 6.71 km2, and the gas reserves is 23.64 x 108m3.the reserves of numerical simulation is 22.45 x 108m3.the dynamic reserves by the pressure draw-down method is between 22.45 x 108 m3.and 22.45 x 108 m3.the results of volumetric method is consistent to that of dynamic method, showing the reliability of gas reserves verification.7.The static and dynamic data both indicated that Puxil well and Puxi3 well are connected, and belonged to the same pressure system. But the connectivity is bad due to the existence of low permeability region between the wells.8.The 3 region composite model was adopted in the pressure buildup interpretation of Puxi 1 well, showing the strong heterogeneity in the well controlling region. The skin factor of this well is negative, indicated that the well is not contamin... |
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