济阳坳陷花沟地区高含He气藏成藏分析  

ACCUMULATION ANALYSIS ON A HELIUM-ENRICHED GAS RESERVOIR IN HUAGOU AREA, THE JIYANG DEPRESSION

作　　者：曹忠祥[1] 车燕[1] 李军亮[1] 李鸿文[1] 

机构地区：[1]胜利油田有限公司地质科学研究院,山东东营257015

出　　处：《石油实验地质》2001年第4期395-399,共5页Petroleum Geology & Experiment

摘　　要：He气在天然气藏中的含量很低 ,一般小于 0 1%。它既有重要的工业价值 ,又是天然气尤其是非烃类天然气成因的重要区分标志。济阳坳陷花沟地区上第三系明化镇组 (Nm )发现的花 5 0 1气藏 ,He气含量达 3 0 8%。气藏中气体成分复杂 ,既有以N2 和CO2 气为主的非烃类气层 ,又有以CH4为主的气层 ,是一个多元复合成因的特殊气藏。δ1 3 CCO2 =-8 3‰ ,3 He/4 He =4 4 7×10 - 6,这些代表性指标表明N2 、CO2 和He等非烃气主要是幔源成因 ;δ1 3 C1 =-4 8.8‰ ,表明CH4气是下第三系生成的有机成因的油型气。气藏位于济阳坳陷和鲁西隆起的结合部 ,受高青断层这一中生界以来长期活动的深大断裂控制 ,与多期次岩浆活动密切相关。CH4气层与N2 、CO2 及He气等非烃气层是两期成藏的产物。CH4聚集成藏早 ,而高含He的非烃类气的聚集成藏发生在距今3Ma以内。Helium content in natural gas reservoirs is very low, usually smaller than 0.1%. Gas helium not only has inmportant industrial values, but also is a major differential mark for the origin of natural gas especially nonhydrocarbons natural gas. In Hua-501 gas reservoir discovered in the Upper Tertiary Minghuazhen Formation (Nm) of Huagou area, the Jiyang Depression, the gas He content is up to 3.08%. The gas components of the gas reservoir is complex. It has not only nonhydrocarbons gas layers dominated by N 2 and CO 2, but also gas layers dominated by CH 4. It is a special gas reservoir of multiple and composite origins. δ 13 C CO 2 is equal to -8.3‰ , and 3He/ 4He is 4.47×10 -6 . These representative indexes reveal that N 2, CO 2, He and other nonhydrocarbons gases are mainly of mantle-source origins. δ 13 C 1 is equal to -48.8‰. This shows that gas CH 4 is organic genetic oil-type gas generated in the Lower Tertiary. The gas reservoir is located in the joint of the Jiyang Depression and the Luxi Uplift. It is controlled by the Gaoqing Fault which is a deep and large rift long activated since the Mesozoic, and is closely related to muti-stage magmatic activities. CH 4 gas layers and N 2, CO 2, He and other nonhydrocarbons gas layers are the products of two stages of accumulation. CH 4 accumulated early, and the accumulation of helium-enriched nonhydrocarbons gases happened within 3Ma from now.

关 键 词：成藏 高含He气藏 花沟地区 济阳坳陷 天然气藏 

分 类 号：P618.130.2[天文地球—矿床学] TE12[天文地球—地质学]