A discussion on the geochemical characteristics and migration and accumulation of natural gas in the eastern Tarim Basin

Lan Xiaodong; Zhu Yanming; Ran Qigui; Cheng Honggang

doi:10.11743/ogg20090311

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A discussion on the geochemical characteristics and migration and accumulation of natural gas in the eastern Tarim Basin
Vol. 30, Issue 3, Pages: 324-329(2009)
Online First：25 June 2009，

Published：2009
DOI： 10.11743/ogg20090311
稿件说明：

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DOI：

Lan Xiaodong, Zhu Yanming, Ran Qigui, et al. A discussion on the geochemical characteristics and migration and accumulation of natural gas in the eastern Tarim Basin[J]. 2009, 30(3): 324-329. DOI： 10.11743/ogg20090311.

摘要

塔东地区存在两套烃源岩

根据对样品组分、碳氢同位素及轻烃组分等方面的综合分析

塔东地区天然气属于有机海相油型气

来自于寒武系—奥陶系烃源岩

形成温度较高

属于高温裂解气。结合碳同位素特征和天然气运移指数ΔR3对该区天然气运聚规律进行了探讨

大致方向由构造低部位向构造高部位运移。从英南2井来看

其气藏充注过程至少有两次。

Abstract

There are two sets of source rocks in eastern Tarim Basin.Comprehensive analysis of components

isotopes of carbon and hydrogen

and light hydrocarbon constituents of the samples from the basin indicates that natural gas there is marine organic oil-prone gas derived from the Cambrian and Ordovician source rocks.The gas was formed at a very high temperature and therefore can be classified as cracked gas.Study on gas accumulation and migration patterns based on character of carbon isotope and gas migration index(ΔR

) shows that the direction of gas migration is generally from structural low to high.Data of the well Yingnan-2 show that the reser-voirs there had experienced at least two times of hydrocarbon charges.