用趋势面分析方法探讨YG气田天然气成藏控制因素及气藏类型

The application of trend surface analysis method in the studies of determining factors of gas field

本文应用趋势面分析的方法，对YG气田的TB、T3构造面，TA-T3层厚度分别作了趋势值和剩余值分析，并结合已有油气田勘探地质资料作了综合分析，探讨了气井的分布、产能和沉积环境与构造位置、剩余值的关系。结果表明，已有的气井在构造剩余趋势和厚度剩余趋势等值线图上均有明显的组合特征，气井皆分布在构造正剩余区内，厚度正剩余有助于天然气的富集，构造控制的气井有较高的产能。同时指出构造、岩性在控制油气分布与聚集上所起的作用；划分了构造、构造岩性这两类气藏；提出了未来勘探布井的原则，并对YG地区作了远景划分。

With trcnd surface analysis method, TB and T3 structural surface bed thiekness between TAand T3 is analyzed on the trend value and thc residual, in YG gas field; together with availablegeologie data in the field a eomprehensive analysis is made on the relationship between the gas welldistribution, the deliverability, the depositional setting and the struetural loeations, the residual.The obtained resuIts of the analysis show that the extant gas wells exhibit obvious eombinationfeatures on isogram of struetural residual trend value and on isogram of thiehness residual trendvalue, thiekness positive residual is beneficial to gas concentration, strueture-eontrolled gas wellshave better deliverability. Besides, we expound the functions of structure and lithology incontrolIing distribution and concentration of oil and gas, divide gas reservoir into structure gasreservoir and strueture lithology gas reservoir,put forward prineiples of arrangement of wells inour future exploration,and make the prospeetive division of YG area.