CAJ | 학술논문

YQ1井钻遇的龙马溪组—五峰组优质黑色页岩单层厚度大，有机碳含量高，有机质成熟度较高，微孔隙、微裂缝发育。分析化验结果表明，YQ1井页岩层甲烷吸附气含量随埋藏深度、地层压力、有机质及黏土含量的增加而增大，含气量达1.0～3.0 m3/t，证实龙马溪组底部是本区页岩气勘探的现实目的层，为具有商业开采价值的优质页岩气层。针对“强改造、高演化”的中国南方海相勘探领域，页岩气成藏赋存具有“构造沉积控局势→保存条件控气藏→岩性物性控甜点”的地质特色，落实富有机质、超常地层压力、脆性微孔缝发育的页岩气甜点区是页岩气勘探评价的第一要务，寻找构造变形较弱、远离通天断层、区域盖层发育和整体保存良好的宽阔向斜区是海相构造坳陷页岩气甜点区评价优选的首要因素。
YQ1정찬우적룡마계조—오봉조우질흑색혈암단층후도대，유궤탄함량고，유궤질성숙도교고，미공극、미렬봉발육。분석화험결과표명，YQ1정혈암층갑완흡부기함량수매장심도、지층압력、유궤질급점토함량적증가이증대，함기량체1.0～3.0 m3/t，증실룡마계조저부시본구혈암기감탐적현실목적층，위구유상업개채개치적우질혈암기층。침대“강개조、고연화”적중국남방해상감탐영역，혈암기성장부존구유“구조침적공국세→보존조건공기장→암성물성공첨점”적지질특색，락실부유궤질、초상지층압력、취성미공봉발육적혈암기첨점구시혈암기감탐평개적제일요무，심조구조변형교약、원리통천단층、구역개층발육화정체보존량호적관활향사구시해상구조요함혈암기첨점구평개우선적수요인소。
The high quality shale of Wufeng-Longmaxi formations that was encountered by well YQ-1 during the drilling pro-cess is characterized by thick single layer,high TOC content,high organic matter maturity,and well developed microscopic pore and cracks. The analysis results reveal that the absorbed methane content of core shale from well YQ-1 increases with the rise of burial depth,formation pressure,content of organic matter and clay minerals. The gas in place(GIP)of the shale reservoirs ranges from 1.0 to 3.0 m3/t,indicating that the shale horizon of the basal of Longmaxi formation and Wufeng forma-tion is the first target stratum with commercial development value. The marine gas shale in Southern China is characterized of“intensive reformation,and high maturity”,and because the occurrence of shale gas resources is characterized by the control factors on distribution,gas pool,and sweet pot that are controlled by tectonics,storage condition and physical properties of rocks respectively. The emergency mission on shale gas exploration is to identify the sweet spot areas that are characterized by organic richness,abnormal formation pressure,and good development of brittle microscopic pore and cracks. The sweet spots of marine shale gas often develop in broad syncline far from faults that reach the surface and is of weak tectonic deformation, good cap rock. The strategy of marine shale gas exploration and development in Southern China should follow the sequences of filtering sweet spots firstly,and then setting demonstration area,finally carrying out large-scale development.