中国陆相天然气成因类型及富集规律

GENETIC TYPE AND ENRICHMENT LAW OF TERRESTRIAL NATURAL GAS IN CHINA

钱凯 王明明 魏伟

Qian Kai Wang Mingming Wei Wei

中国陆相盆地天然气资源分布广泛,在东、中、西部及东南海域都有大中型气田发现。天然气主要有生物成因、生物-热复合成因、偏腐泥型热(裂)解、偏腐殖型热(裂)解及生物降解5种类型。富气凹陷主要有持续深埋型、脉动深埋型、持续中埋型、先缓后速中埋型及持续浅埋型5种类型。富气凹陷内的断裂背斜构造带天然气富集程度最高,多数是沿着古隆起或继承性构造成线状分布或围绕生烃洼陷成弧状展布。地温场强度高或煤系烃源层发育的中-深层及微生物生存条件好的中-浅层,是陆相天然气富集的两个最有利领域。

Natural gas resources are widespread in terrestrial basins of China.Large or middle size gas fields have been found in southeast sea areas.The terrestrial gas can be divided into five genetic types: biogenetic-thermal overprint gas, near-sapropelic pyrolysis gas, near-humic pyrolysis gas and biological degradation gas.Gas rich depressions include five types: continuously deep buried, pulsative deep buried, continuously mid-deep buried, early slow and late rapid mid-deep buried and continued shallow buried types.Gas richest places are faultedanticline zones within the depressions.They are mostly distributed along paleouplifts, inherited structures or neighbouring places around source-rock sags.Two most advantageous domains of terrestrial gas enrichment are high geotemperature or rich coal measure regions in mid-deep depth and favourible environment for microorganism at middle-shallow depth.

10.11743/ogg19960301