CAJ | 학술논문

为加快我国页岩气的勘探进程,应用地质异常找矿理论,依据页岩气聚集特征和形成条件,将页岩气聚集的地质异常序列区分为背景地质异常、页岩气聚集地质异常、页岩气综合异常和页岩气商业地质异常4个层次.其中,背景地质异常主要指标是沉积盆地和泥页岩发育;页岩气聚集地质异常主要指标是页岩厚度和总有机碳含量;页岩气综合异常的主要指标是含气量和储气量,以及与其密切相关的温度、压力、孔隙度、页岩的厚度、总有机碳含量、黏土成分和湿度,间接指标是与页岩气综合地质异常密切相关的地球化学异常和地球物理异常;页岩气商业地质异常的主要指标是页岩气产量、产能及页岩的裂缝发育程度和脆性.上述4个层次的异常分别是页岩气勘探远景区段预测、页岩气勘探有利聚集区段预测、页岩气勘探有利目标区段圈定和页岩气商业聚集区段圈定的依据.我国页岩气勘探的远景区已基本查明,页岩气勘探的有利聚集区段的预测也取得了大量成果,亟待开展和加快页岩气勘探有利目标区段和商业聚集区段的圈定工作.
위가쾌아국혈암기적감탐진정,응용지질이상조광이론,의거혈암기취집특정화형성조건,장혈암기취집적지질이상서렬구분위배경지질이상、혈암기취집지질이상、혈암기종합이상화혈암기상업지질이상4개층차.기중,배경지질이상주요지표시침적분지화니혈암발육;혈암기취집지질이상주요지표시혈암후도화총유궤탄함량;혈암기종합이상적주요지표시함기량화저기량,이급여기밀절상관적온도、압력、공극도、혈암적후도、총유궤탄함량、점토성분화습도,간접지표시여혈암기종합지질이상밀절상관적지구화학이상화지구물리이상;혈암기상업지질이상적주요지표시혈암기산량、산능급혈암적렬봉발육정도화취성.상술4개층차적이상분별시혈암기감탐원경구단예측、혈암기감탐유리취집구단예측、혈암기감탐유리목표구단권정화혈암기상업취집구단권정적의거.아국혈암기감탐적원경구이기본사명,혈암기감탐적유리취집구단적예측야취득료대량성과,극대개전화가쾌혈암기감탐유리목표구단화상업취집구단적권정공작.
Based on the Geo-anomaly Ore-prospecting Theory and the characteristics and forming conditions of shale gas pools, the Geo-anomaly sequence of shale gas pools is divided into four levels, namely Background Geo-anomaly, Gas-accumulation Geo-anomaly, Gas-rich Integration Anomaly, and Profitable Geo-anomaly. The main indexes of Background Geo-anomaly are sedimentary basins and shale developed; the main indexes of Gas-accumulation Geo-anomaly are the thickness of shale and the total organic content (TOC); the main indexes of Gas-rich Integration Anomaly include gas content and gas reserves, as well as the associated temperature, pressure, porosity, thickness of shale, TOC, composition and humidity of clay, and geochemical and geophysical anomalies are the complementary indexes of Gas-accumulation Geo-anomaly; the main indexes of Profitable Geo-anomaly are gas production, gas productivity, as well as fracture density, brittleness of the shale. The above mentioned four levels of anomaly are the bases for identifying prospective areas, favorable plays, exploration targets, and commercial shale gas pools respectively. Prospective areas for shale gas exploration have been basically identified in China and the prediction of favorable plays is also fruitful. In contrast, the identification of exploration targets and commercial shale gas pools are still in the initial stage, thus they should be strengthened and speeded up.