缝合线成因新认识

地学前缘 ›› 2011, Vol. 18 ›› Issue (3): 241-249.

缝合线成因新认识

谭钦银，王瑞华，牟传龙，程锦翔，王正和，付建元

1. 中国地质调查局成都地质调查中心，四川成都 610081
2. 川庆钻探工程有限公司地球物理勘探公司，四川成都 610213

收稿日期:2010-09-03 修回日期:2010-11-13 出版日期:2011-05-22 发布日期:2011-05-20
作者简介:谭钦银（1964—），男，副研究员，沉积学专业。E-mail:tqy64511@sinacom
基金资助:
中国地质调查局项目（1212011120969）

New consideration on the genesis of suture.

1. Chengdu Center of China Geological Survey， Chengdu 610082， China
2. Geophysical Prospecting Company of Chuanqing Drilling Engineering Company, Chengdu 610213, China

Received:2010-09-03 Revised:2010-11-13 Online:2011-05-22 Published:2011-05-20

摘要/Abstract

摘要：

传统观点认为，碳酸盐岩中的缝合线是在岩石负载或构造应力作用下压溶形成的，是一种化学压实作用的产物。对缝合线进行综合研究，发现其具有“四性特征”，即完整性、亲烃性、排孔性及胀裂汇聚性。综合以上“四性”认为，缝合线主要是岩石在负重或构造应力作用下烃类（或泥质）使岩石发生胀裂形成的一种锯齿状裂缝，是烃类（或泥质）开辟的排烃通道，压溶作用对缝合线的贡献还有待研究。与碳酸盐岩相比，泥岩不发育缝合线，主要在于泥岩优势孔隙半径较大，烃类可以通过微孔以渗透方式向外排放，不需要形成缝合线。通过缝合线形成机理探讨，查明了碳酸盐岩与泥岩排烃方式的区别，进而对碳酸盐岩与泥岩封盖性进行对比。

关键词: 缝合线, 压溶, 胀裂, 汇聚；完整性, 亲烃性, 排孔性

Abstract:

It is traditionally considered that sutures in the carbonates were formed under the pressure solution caused by rock load or tectonic stress, which is a result of chemical compaction. Here we demonstrate that sutures are characterized by integrality, hydrophilicity, antihole， and burst and concourse. Sutures are a kind of sawtooth cracks caused by the rock bursting due to hydrocarbons (or mud) under the rock load or tectonic stress, which are hydrocarbon (mud)expulsion passages. The contribution of pressure solution is not clear. Compared with carbonates, mudstone has few sutures. This is because the mudstones have relatively larger pore radius, and hydrocarbons can be expelled through micropore permeation. on the basis of the studies of formation mechanism of sutures, we investigated the difference of hydrocarbon expulsion between carbonates and mudstones, and compared their sealing capabilities.

Key words: suture, pressolution, burst, concourse； integrality, hydrophilicity, antihole

中图分类号:

谭钦银，王瑞华，牟传龙，程锦翔，王正和，付建元. 缝合线成因新认识[J]. 地学前缘, 2011, 18(3): 241-249.