摘要
应用天然气烃指纹特征可以有效地分析新场气田侏罗系蓬莱镇组蓬一气藏气层连通性。在有利天然气聚集的井区或层段 ,一些与天然气聚集保存条件相关的烃指纹参数呈现较明显的规律性 ,如C3 -4/C5-6、烷烃C5-6/C7-8、己烷 /环己烷呈现明显的增高 ,正构烷烃 /异构烷烃、环戊烷 /环己烷类、异构单取代 /异构多取代相对减小。新场气田蓬莱镇组蓬一气藏气层各项烃指纹参数在横向上变化较大 ,气层的连通性较差 ,应属构造岩性气藏。天然气各项烃指纹参数由浅到深呈现明显的变化规律 ,充分反映了天然气运移成藏过程中的色层效应及组分的分离过程 ,说明气藏在形成过程中 ,烃类系来自深层 ,以垂向运移为主 ,并预示着深部地层天然气成藏、保存条件逐渐变好 ,具有找到气藏的可能性。
Hydrocarbon fingerprint characteristics of natural gas can be effectively used to analyze connectivity between gas layers in J 3p 1 gas pool in Xinchang gas field.In wellblocks or intervals favorable for gas accumulation,certain hydrocarbon fingerprint parameters that are related to gas accumulation and preservation conditions show evident regularity,such as C 3-4/C 5-6,alkane C 5-6/C 7-8 and hexane/cyclehoxane show obvious increasing trend,while normal alkane/isoalkane,cyclopentane/cyclohexane and isomeric mono-substitution/isomeric poly-substitution show relatively decreasing trend.All the hydrocarbon fingerprint parameters of gas layers in J 3p 1 gas pool in Xinchang gas field show prominent lateral variation and connectivity between gas layers is poor,indicating the characteristics of structural-lithologic gas pool.The clear regularity of hydrocarbon fingerprint parameters from shallow to deep layers reflects the chromatographic effect and the component separating process during gas migration and accumulation,i.e.gas pools have mainly been formed through vertical migration of hydrocarbons generated from the deep source rocks.All these indicate that conditions of hydrocarbon accumulation and preservation would become better and better to the deep layers,and there will be the possibility of discovering gas pools at depth.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
2004年第3期349-353,共5页
Oil & Gas Geology
关键词
天然气
烃指纹
气藏
地球化学
描述
natural gas
hydrocarbon fingerprint
gas pool
geochemistry
description
