储层包裹体古压力的求取及其与成藏关系研究——琼东南盆地崖21-1构造实例剖析  

ACQUIREMENT OF FLUID INCLUSION PALEO-PRESSURE AND IT RELATION TO RESERVOIRING ——TAKING YA 21-1 STRUCTURE IN QIONGDONGNAN BASIN AS AN EXAMPLE

作　　者：胡忠良[1] 肖贤明[1] 黄保家 

机构地区：[1]中国科学院广州地球化学研究所有机地球化学国家重点实验室 [2]中海石油湛江分公司技术部

出　　处：《天然气工业》2005年第6期28-31,共4页Natural Gas Industry

基　　金：中国科学院广州地球化学研究所有机地球化学国家重点实验室开放基金资助(OGL200302)。

摘　　要：文章通过对琼东南盆地崖21-1构造陵水组砂岩储层中的次生气态烃包裹体和同期盐水包裹体的精细分析并与崖13-1气田包裹体特征进行比较性研究,利用PVTsim软件模拟计算了包裹体的捕获温度和压力,进而探讨储层古压力的演化与天然气充注的关系。结果表明,崖21-1构造渐新统陵水组储层大约在上新世早期压力系数已高达1.65(强超压),上新世晚期压力系数已达到1.98,推测超压形成时间大约开始于晚中新世早期,早于崖南凹陷斜坡崖城组烃源岩大量生排气阶段,妨碍了天然气的大量充注,未形成商业性气田。可见,精细地分析高压储层压力的演化及其与烃源灶生排烃高峰的关系,可减少高压成藏系统勘探风险。Through analyzing and comparing the characteristics of the secondary gaseous hydrocarbon inclusions and contemporaneous salt-water inclusions in Lingshui Formation sandstone reservoir in Ya 21-1 structure with those in Ya 13-1 gas field in Qiongdongnan Basin, the relation between paleo-pressure evolution and gas charge in the reservoir is discussed on the basis of calculating the entrapped temperatures and pressures in the inclusions by applying PVT sim software. The results indicated that the pressure coefficient of Lingshui Formation reservoir in Ya 21-1 structure was up to 1. 65 in Early Pliocene and reached to 1. 98 in Late Pliocene, therefore it was inferred that the overpressure formation time was earlier than the peak hydrocarbon generating-expelling stage of Yacheng Formation source rocks on the slope of Yanan Seg, about beginning at the early Late Miocene, thus hampering the gas charge and the commercial gas reservoir formation. So the fine analysis of the relation between high reservoir pressure evolution and peak hydrocarbon generating-expelling stage can decrease the risk of exploring overpressured reservoiring systems.

关 键 词：琼东南盆地 砂岩 储层特征 包裹体 古压力 成藏关系 天然气 

分 类 号：P618.13[天文地球—矿床学]