The gas–water relationship in the Permian and Triassic biohermal beach reservoirs in the Sichuan Basin is complex, which results in a low drilling success rate and leads to sidetracking or even secondary sidetracking in some wells. Therefore, high-precision gas–water identification is the key to the drilling success rate. In this paper, the biohermal gas reservoir in the T work area of the eastern Sichuan Basin was taken as an example. Firstly, the frequency information of seismic data sensitive to gas bearing properties was exploited sufficiently by taking the deep/shallow resistivity information which is sensitive to gas–water discrimination as a constraint and the nonlinear algorithm as a bridge. Then, combined with the information of full-band relative wave impedance, a nonlinear mapping relationship between the logarithmic difference curve of deep/shallow resistivity and the seismic waveform was established, and the gas bearing properties of the reservoir were predicted. In this way, a post-stack gas prediction method was developed. Finally, field application and effect analysis were carried out. And the following research results were obtained. First, gas layer information indicated by deep/shallow resistivity not only has the function of verification well, but can be extracted as a priori information for the constraint of seismic data. Second, frequency division information increases the mapping relationship between multi-frequency data volume and the logarithmic difference of deep/shallow resistivity, and the colored inversion, as the more reasonable full-band relative-wave impedance seismic data, is more conducive to gas and water identification. Third, based on the nonlinear mapping relationship, the data volume of a gas sensitive factor was obtained, and the range of gas layers was quantified, so as to realize the quantitative characterization of gas bearing properties. It is concluded that the gas prediction technology developed in this paper provides an effective and practical post-stack gas prediction method, and its field application effect is good, presenting wide popularization and application prospects.

中国西部山地复杂构造的倒转背斜是重要的含油气构造类型之一.高陡复杂构造区许多失利井,与倒转背斜的地质特点及其地震剖面反射特征认识不足有关.依据地面地质、钻井和测井资料建立倒转背斜模式,采用模型正演和偏移技术分析不同类型倒转背斜的地震响应特征,建立在地震剖面上识别倒转背斜的模式和方法,有助于在地震剖面上查明倒转背斜形态.具有较高信噪比的山地复杂构造,叠前深度偏移剖面能很好地反映出倒转背斜形态.倒转背斜正常翼地层剥蚀程度低,埋藏深度适中,可成为良好的油气圈闭;倒转翼地层陡倾,断块发育,油气成藏条件差;倒转翼下方潜伏背斜保存条件好,是油气聚集有利场所,油气勘探效果良好.

为了给盐穴储气库建设提供高精度的三维地震资料,以YY盐穴储气库三维地震勘探为例,对影响地震资料信噪比和分辨率的采集关键参数面元、覆盖次数、接收线距和激发参数进行优化.结果 显示,小面元、宽方位、高密度空间对称采样有利于提高地震波成像精度.较小的接收线距和滚动距有利于压制采集脚印,减小偏移噪声;小药量选岩性激发、小组合接收有利于拓展资料频宽.高覆盖次数有利于压制随机干扰,提高资料的信噪比.城区及含有危险源化工厂等“禁炮区”应采用多方位观测、井震混源激发的特观技术.该技术可识别出断距小于10m的断层,达到盐穴储气库的地质精度要求.

在天然气脱水生产过程中采取有效措施保护好三甘醇,可以保证脱水装置的长期稳定运行,降低装置故障机率,节约天然气脱水的操作成本,通过现场的生产情况提出了一些保护三甘醇的有效措施,有利于延长三甘醇的使用寿命,降低天然气脱水操作成本.

Carboniferous system is the main production layer of East Sichuan and reserves, especially volumetric method reserves is the base of developing production plan . The corroboration of effective reservoir lower limit in reserves calculation respects parameters influence effective reservoir thickness, porosity and gas saturation directly. It is discovered that because different storage type lead different hole type and different hole structure , there is different porosity lower limit in different effective reservoir. In this paper , through analysis of 209 carboniferous rock mercury penetration data of qilixia, datianchi, dachigan, gaofengchang,yun'anchang,fuchengzai etc of East Sichuan , derive differ reservoir rock, effective reservoir porosity lower limit ,and calculated 8 wells of east Sichuan carboniferous volumetric method reserves. Based on these lower limits and compared with the different effective reservoir porosity lower limit of different reservoir rock , the result discrepancy 6. 22 % . Because reserves calculation in this method considered rock type, pore types and pore throat structure characteristic, the result is more closer the real formation.

地质特征 福成寨气田石炭系气藏位于四川省大竹县境内,为川东断褶带华蓥山与铜锣峡背斜之间大竹向斜内的一个梳状低缓背斜构造,是一个具有统一原始气水界面的以孔隙为主的裂缝-孔隙型层状边水的弹性气驱气藏,含气面积38.06km2,平均孔隙度5.48%,平均含水饱和度15%,原始气藏压力为49.34 MPa.福成寨气田石炭系气藏探明地质储量近百亿立方米,占整个福成寨气田探明地质储量的82.66%,是福成寨气田的主力气藏,该气藏开采至今已持续稳产13年,采出程度超过60%,是川东气田同类气藏开发效果最好的.