CAJ | 학술논문

以地震、测井、录井及地球化学资料为基础,本文采用Easy-Ro方法对渤海湾盆地青东凹陷进行了古地温反演,计算了该地区的古地温梯度,并进一步利用人工取井和盆地模拟方法,确定了沙四上亚段和沙三下亚段烃源岩的成熟度和展布特征,预测了有利生烃区带的分布.结果表明,青东地区的古地温梯度为3.8℃/100 m;沙四上亚段烃源岩的成熟度较高,进入成熟-高成熟阶段;沙三下亚段的烃源岩成熟度相对较小,为成熟-低成熟阶段;纵向上,沙四上亚段较沙三上亚段生烃范围大、烃源岩成熟度高;横向上,主要的生烃区带集中在青东凹陷主体洼陷地区(北部断阶带、北次洼、南次洼、中次洼)以及青南洼陷,青东凹陷西斜坡地区未进入生烃门限.
이지진、측정、록정급지구화학자료위기출,본문채용Easy-Ro방법대발해만분지청동요함진행료고지온반연,계산료해지구적고지온제도,병진일보이용인공취정화분지모의방법,학정료사사상아단화사삼하아단경원암적성숙도화전포특정,예측료유리생경구대적분포.결과표명,청동지구적고지온제도위3.8℃/100 m;사사상아단경원암적성숙도교고,진입성숙-고성숙계단;사삼하아단적경원암성숙도상대교소,위성숙-저성숙계단;종향상,사사상아단교사삼상아단생경범위대、경원암성숙도고;횡향상,주요적생경구대집중재청동요함주체와함지구(북부단계대、북차와、남차와、중차와)이급청남와함,청동요함서사파지구미진입생경문한.
Based on seismic, logging and geochemical data, the Easy-Ro model was adopted to invert the paleogeothermal history of the Qingdong sag, and to calculate the paleogeothermal gradient. Based on data of artificial wells and thickness of the hydrocarbon source rocks, the maturity and distribution of the upper 4th member and the lower 3th member of the Shahejie Formation were discussed and the potential hydrocarbon generation zone was predicted. The results showed that the paleogeothermal gradient of the Qingdong Sag was 3.8℃/100m; the maturity of source rocks in the upper 4th member of the Shahejie Formation was higher than that of the lower 3th member of the Shahejie Formation which are in the stages of mature-over mature and mature-low mature, respectively. In a vertical plane, the hydrocarbon generation domain and maturity of source rocks of the upper 4th member of the Shahejie Formation was larger than those of the lower 3th member of the Shahejie Formation, while in a plane, the main hydrocarbon zone are located on the main part of the Qingdong Sag (North fault-step, north sub-sag, middle sub-sag and south sub-sag) and the Qingnan subsag. The western slope of the Qingdong Sag did not reach the hydrocarbon generating threshold.