CAJ | 학술논문

鄂尔多斯盆地煤系在埋藏早期因释放有机酸而使地层水呈弱酸性，含氧羧酸溶蚀铝硅酸盐生成大量孔隙而使砂岩易于压实，其后的地层升温促进Al3+和Si2+的络合物分解生成SiO2、自生粘土和铁方解石，导致砂岩区域致密化。晚侏罗-早白垩世的构造热事件导致煤系大量生烃和地层水汽化，促使高压流体(甲烷+水蒸气)充斥整个封存箱，形成盆地级高温高压气藏。晚白垩-古新世盆地区域性抬升剥蚀导致煤系埋藏变浅，地温梯度降低，使地层中甲烷被保留而水蒸气凝析成水，高温高压气藏逐渐转化为低温负压气藏。
악이다사분지매계재매장조기인석방유궤산이사지층수정약산성，함양최산용식려규산염생성대량공극이사사암역우압실，기후적지층승온촉진Al3+화Si2+적락합물분해생성SiO2、자생점토화철방해석，도치사암구역치밀화。만주라-조백성세적구조열사건도치매계대량생경화지층수기화，촉사고압류체(갑완+수증기)충척정개봉존상，형성분지급고온고압기장。만백성-고신세분지구역성태승박식도치매계매장변천，지온제도강저，사지층중갑완피보류이수증기응석성수，고온고압기장축점전화위저온부압기장。
During the early burial period, the ground water of coal series in the Ordos Basin became weakly acidic, due to the release of organic acids from coal. The corrosion of oxygen-containing carboxylic acid then generated a large number of pores in aluminum silicate and made sandstone easily to be compacted. The following rise of for-mation temperature promoted the Al3+ and Si2+ complexation reduce to SiO2 , clay and ferrocalcite, which led to the regional sandstone densification. From the Late Jurassic to the Early Cretaceous, tectonic-thermal events resulted in the hydrocarbon generation of coal series and the vaporization of formation water, which promoted high-pressure fluid ( methane and steam) flood the whole storage box. A basin-scale high-temperature and high-pressure gas reservoir was founded. From the Late Cretaceous to Paleocene, the regional uplift and erosion of strata made the coal series burial depth decrease and the geothermal gradient decrease, so that vapor condensated into water, while the CH4 gas retained gradually. High-temperature and high-pressure gas reservoir was trans-formed into low-temperature and under-pressure reservoir.