渤海湾盆地428构造烃源岩地球化学特征及评价
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摘要
近两年来在渤海湾盆地428围区钻探了一批新井,见到了良好的油气显示。为了弄清该区油气成藏条件,提高油气勘探成功率,对研究区东营、沙河街组3套烃源岩开展新一轮评估,对其有机碳含量、干酪根元素组成、干酪根类型以及镜质体反射率等地球化学参数进行了分析。研究表明,渤海湾盆地428地区烃源岩分布范围广、厚度大;烃源岩有机质丰度高,有机碳含量普遍大于1.0%;烃源岩有机质类型较好,以Ⅱ型干酪根为主,少量Ⅰ型;有机质处于低至成熟阶段,有利于石油生成。研究区3套烃源岩都是较为有利的烃源岩,相对而言,埋深最大的沙三段品质最好,沙一+二段次之,埋深最浅的东营组最差。
In 428 area, Bohaiwan Basin, better oil and gas show appears from some newly drilled wells in recent two years. In order to understand fully reservoir-forming conditions and to increase an exploration success ratio, a new-roll evaluation on three suites of source rock from both Dongying and Shahejie formations was carried out, and some geochemical parameters were analyzed, including organic carbon content, kerogen composition and type, and vitrinite reflection ratio. Results show that(1) source rock with large thickness is widely developed at the study area;(2) the organic matter has high abundance and the carbon content is often more than1.0 %;(3) the types of organic matter are better, with type II kerogen as the soul and a little type I kerogen;(4) the organic matter is in low mature to mature stage, which is favorable for generating oil;(5) three suites of source rock are favorable ones, in which, the best is Shahejie 3 Member with the largest burial depth, the second for Shahejie 1 and Shahejie 2 members, and the last for Dongying Formation with the shallowest burial depth, respectively.
In 428 area, Bohaiwan Basin, better oil and gas show appears from some newly drilled wells in recent two years. In order to understand fully reservoir-forming conditions and to increase an exploration success ratio, a new-roll evaluation on three suites of source rock from both Dongying and Shahejie formations was carried out, and some geochemical parameters were analyzed, including organic carbon content, kerogen composition and type, and vitrinite reflection ratio. Results show that(1) source rock with large thickness is widely developed at the study area;(2) the organic matter has high abundance and the carbon content is often more than1.0 %;(3) the types of organic matter are better, with type II kerogen as the soul and a little type I kerogen;(4) the organic matter is in low mature to mature stage, which is favorable for generating oil;(5) three suites of source rock are favorable ones, in which, the best is Shahejie 3 Member with the largest burial depth, the second for Shahejie 1 and Shahejie 2 members, and the last for Dongying Formation with the shallowest burial depth, respectively.
引文
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[3]孙永河.渤中坳陷新生代构造特征及其对油气运聚的控制[D].大庆:大庆石油学院,2008.
[4]王德英,余宏忠,于海波,等.渤海海域新近系层序地层格架约束下岩性圈闭发育特征分析及精细刻画:以石臼坨凸起明下段为例[J].中国海上油气,2012,24(增刊1):23-28.
[5]范厚江,罗小平,李鹏.辽中凹陷优质烃源岩评价[J].天然气技术与经济,2013,7(4):18-21.
[6]李鹏,徐猛,尹诗琪,等.辽中富烃凹陷烃源岩测井定量评价[J].天然气技术与经济,2012,6(6):19-22.
[7]赖维成,徐长贵,王晓刚,等.秦南凹陷古近系层序地层和沉积体系研究及油气勘探方向探讨[J].中国海上油气,2007,19(5):300-305.
[8]刘博奥.渤中凹陷烃源岩研究[D].青岛:中国石油大学(华东),2011.
[9]张国良,姚长华,张云慧.从石臼坨凸起浅层油气的重大发现看渤东地区的勘探潜力[J].中国海上油气(地质),2000,14(2):84-92.
[10]杨海风,魏刚,王德英,等.秦南凹陷秦皇岛29-2油气田原油来源及其勘探意义[J].油气地质与采收率,2011,18(6):28-31.
[11]蒋有录,查明.石油天然气地质与勘探[M].北京:石油工业出版社,2006.
[12]杨万里,李永康,高瑞祺,等.松辽盆地陆相生油母质的类型与演化模式[J].中国科学,1981(8):1 000-1 009.
[13]罗睿.川西与川中地区T3-K烃源岩地球化学特征及对比[D].成都:成都理工大学,2012.
[14]陈婷.川西与川中地区T3-K天然气地球化学特征及对比[D].成都:成都理工大学,2012.
[15]Tissot,B.P.and Welte,D.H.Petroleum formation andoccurrence:A new approach to oil and gas exploration[M].Berlin,Heidelberg,New York:Springer-Verlag,1978:1-362.
[16]侯强,李延飞,周瑶,等.川西坳陷须家河组须三段烃源岩地化特征[J].天然气技术与经济,2014,8(2):5-8.
[17]胡圣标,王集晠,张容燕.利用镜质体反射率数据估算地层剥蚀厚度[J].石油勘探与开发,1999,26(4):42-45.