轮南地区天然气分布特征及成因

王晓梅; 张水昌

doi:10.11743/ogg20080208

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轮南地区天然气分布特征及成因
Distribution and genesis of natural gas in Lunnan area
2008年29卷第2期页码：204-209
网络首发：2008-04-24，

纸质出版：2008
DOI： 10.11743/ogg20080208
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王晓梅, 张水昌. 轮南地区天然气分布特征及成因[J]. 石油与天然气地质, 2008,29(2):204-209. DOI： 10.11743/ogg20080208.

Wang Xiaomei, Zhang Shuichang. Distribution and genesis of natural gas in Lunnan area[J]. 2008, 29(2): 204-209. DOI： 10.11743/ogg20080208.

摘要

塔里木盆地轮南地区油气分布非常复杂.轮南地区所有工业油气井、正试井和显示井的天然气组分分析表明

甲烷占绝对优势

整体上属典型的干气.天然气干燥系数和气油比从东到西降低

反映了气侵是从轮古东斜坡开始逐渐向西进行的.结合储层中大量存在的焦沥青

对比塔里木盆地其他地区的天然气特征分析

认为轮南地区天然气主要是来自于高-过成熟的中-下寒武统烃源岩的原油裂解气.

Abstract

Oil and gas distribution in Lunnan area is very complicate in Tarim basin.Component analysis of the natural gas from the commercial wells in Lunnan area indicates that the gas here contains mostly methane and is typical dry gas.The dry coefficient and the gas/oil ratios decrease from east to west

suggesting a westward gas invasion from the east slope.Combining the fact that abundant pyrobitumen exists in the reservoirs with the ana-lysis of gas characteristics from other areas in Tarim basin

we conclude that gas in Lunan area is cracked gas from crude oils generated by the mature to over-mature Middle-Lower Cambrian source rocks.