CAJ | 학술논문

查干凹陷下白垩统发育有苏一段、巴二段和巴一段3套烃源岩。该地区下白垩统三套烃源岩中巴二段是最重要的生油层系,主要成因是深湖-半深湖和滨浅湖环境,以深灰色、灰黑色泥岩为主,有机质成熟度基本达到成熟阶段,局部地区已达到过成熟。同时该段有机质丰度较好,有机质类型主要以Ⅱ型为主。而苏一段和巴一段烃源岩总体评价为中-差烃源岩,为该地区次要烃源岩。下白垩统烃源岩具良好的生烃潜力,油气勘探前景良好。
사간요함하백성통발육유소일단、파이단화파일단3투경원암。해지구하백성통삼투경원암중파이단시최중요적생유층계,주요성인시심호-반심호화빈천호배경,이심회색、회흑색니암위주,유궤질성숙도기본체도성숙계단,국부지구이체도과성숙。동시해단유궤질봉도교호,유궤질류형주요이Ⅱ형위주。이소일단화파일단경원암총체평개위중-차경원암,위해지구차요경원암。하백성통경원암구량호적생경잠력,유기감탐전경량호。
Three sets of source rocks of the lower Cretaceous are distributed in the Chagan sag of the Yingen-Ejinaqi basin. Based on the analytic technique of the Rock-Eval, GC-MS, GC-MS-MAT, and knowing from the precipitation facies and seismic facies, the results indicate that the Second Member of Bayingebi Formation is the principal source rock, and the possible source rocks in this formation are dark black mudstone and dark grey mudstone deposited in an environment of semi-deep lake or deep lake or lake beach, shallow lake which has a high organic matter abundance, and the organic materials take type II kerogen as the dominant factor. The thermal evolutions of the most organic matter have reached the maturity stage. The quantitative evaluation of hydrocarbon-generating potential of the First Member of Bayingebi Formation and First Member of Suhongtu Formation in the basin is not very high, we can make it as the secondary source rock. Therefore, a better potential ofoil and gas prospect in the Lower Cretaceous of the Chagan Sag area is proposed.