蒲西气田石炭系气藏开发效果评价及治水措施研究

【作者】 任洪明；

【导师】 张烈辉； 蒋安亚；

【作者基本信息】 西南石油学院 ， 石油与天然气工程， 2004， 硕士

【摘要】 通过对气田进行开发效果评价和对有水气藏进行科学合理的治理开采是提高气藏开发效益的一种通行的极为有效的方法，是气田开发中的必要手段。本文在全面总结分析蒲西气田石炭系气藏开发效果的基础上提出了下一步开发和治水措施，主要做了以下研究内容： 1、对构造进行了研究，在原有地震反射构造图的基础上，利用新完钻井资料对原构造图进行了校核，根据实钻资料对原构造图进行了修改。 2、进行了地层分层和对比研究，主要根据三口井的岩性及测井资料，进行了地层的细层划分和对比。 3、开展了储层特征研究。利用蒲西气田石炭系气藏的物性及压汞资料对储层特征进行了较全面分析，并进一步对储层有效储层孔隙度下限值为进行了验证。 4、对各单井的有效储层厚度进行了统计和校正。根据有效孔隙度下限值统计了蒲西1、3、4井的各类储层的物性（电性）参数，并进行了岩心孔隙度校正及有效厚度的校正。 5、开展了气水界面的研究．综合利用气藏静、动态资料，采用三种方法，即测井法、岩心法、折算压力系数等三种方法确定了该气藏的气水界面。 6、建立了气藏地质模型。 7、对气藏储量进行了复核。在对气藏构造、储层综合研究的基础上，将气藏分为气区及气水过渡区进行了容积法储量复核。 8、开展了气藏动态特征研究，对气藏的水侵量进行了估算，对气藏治水措施进行了分析。 9、对蒲西1井的试井资料进行了解释和全面分析。 10、对气井的产能进行了分析。 11、编制了气藏开发开发动态预测方案，并采用气藏数值模拟技术对气藏开发动态进行了预测。 12、对各开发开发动态方案技术指标进行了对比。 通过上述各方面的研究，所取的主要成果和认识有： 1、在原有地震反射构造图的基础上，重新编制了“四川盆地蒲西二叠系下统底界构造图”。 2、石炭系地层可以划分为C₂hl³、C₂hl²、C₂hl¹三段，并编制了蒲西石炭系气藏地层对比图，蒲西石炭系地层分布比较稳定。 3、进一步验证了其有效储层孔隙度下限值为：孔隙度大于或等于3％。并将储层分为Ⅰ类（孔隙度≥12％），Ⅱ类（12％＞孔隙度≥6％），Ⅲ类（6％＞孔隙度≥3％）。 4、各单井储层厚度统计结果表明，蒲西石炭系气藏以储渗性能较差的Ⅲ类储层为主，所占百分比在50%以上。 5、综合多种方法确定该气藏的气水界面为一3770m。确定了气藏的含气面积为6 .7 1 km，。 6、本次容积法储量复核面积为6.71km，，复核容积法储量为23.64 X 10渝，:数值模拟储量为22.45 x 10翁‘;利用压将法计算的动态储量介于17.66 xlo沛，²0.76 X 10只m，之间，气藏的容积法储量与动态储量比较一致，说明本次复核的储量是比较可靠的。 7、静态、动态资料均可以证实蒲西1井和蒲西3井是连通的，属于同一个压力系统，但两井之间存在有低渗透带，其连通性不是很好。 8、蒲西1井压力恢复试井解释中采用了三区复合模型，证明该井控制范围内储层非均质性强;该井表皮系数为负，说明井筒周围未被污染。 9、蒲西1井自1996年投产以来一直以15.Oxl口m=飞/d稳定生产至今，目前生产压差己达7.76MPa，加之该气藏蒲西3井产水，气藏为边水气藏，为了防止边水向蒲西1井突进，不能开大蒲西1井的产气量，目前仍可按原产量15.0 xl口耐/d左右生产。 10、推荐了方案4做为蒲西石炭系气藏下一步开发的实施方案。该方案在蒲西3井开展排水采气。方案4的主要技术指标为:气藏的生产井数为2口，生产规模为24.0 X 10‘m:，/d（0.792 X 10闪m:‘/a），采气速度为3.39%，稳产期性年7个月，稳产期结束气藏的累计采出程度为31.04%，预测期结束气藏累计采气14.91 x 10日m3，累计采出程度为63.58%，预测期末的日产气量为6.04 x 104m:飞/d，期末平均地层压力为14.ZIMPa;预测期结束累计产水n.77xl了m3，期末日产水量16.05m3/d。 关键词:储层特征开发效果评价储量水侵量动态预测排水采气更多还原

【Abstract】 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更多还原