梨树断陷早白垩世早期地层归属及勘探意义
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摘要
松辽盆地早白垩世演化主要经历了裂陷期、断陷期和断坳转换期,断陷早期沉积的沙河子组为主要生烃层系,目前断陷层发现的油气绝大部分来源于该层系。本文通过盆地演化、区域地层对比、岩石测年并结合前人研究成果,对梨树断陷早白垩世早期演化进行了重新认识,认为沙河子组一段沉积时为分隔式洼陷槽,沙河子组二段才逐渐形成统一湖盆,原划分为火石岭组洼陷火山岩之上的地层应归于沙河子组一段,其存在有效烃源岩。对该套烃源岩为中心的含油气系统研究,前期勘探没有引起足够重视,应为梨树断陷下步勘探重点关注的领域。
The evolution of the early Cretaceous in Songliao Basin experienced rifting, faulting period, fault depression conversion period, Shahezi formation sedimentation of the early fault depression is the main source rocks, at present oil discovered in the fault depression layer most came from the layer system. In this paper, with the evolution of the basin, the regional stratigraphic correlation, rock dating and combined with the results of previous studies, Reunderstanding of Lishu fault depression of Early Cretaceous evolution, K1 sh1 sedimentary is divided trough, K1 sh2 was gradually formed a unified Lake Basin, the former divided layer into Huoshiling formation on volcano rock should be attributed to the K1 sh1 layer, it developed effective hydrocarbon source rocks. Research on petroleum system as the center of the hydrocarbon source rock, Preliminary exploration has not aroused enough attention, the further exploration in the field of Lishu fault depression should focus on of the layer.
The evolution of the early Cretaceous in Songliao Basin experienced rifting, faulting period, fault depression conversion period, Shahezi formation sedimentation of the early fault depression is the main source rocks, at present oil discovered in the fault depression layer most came from the layer system. In this paper, with the evolution of the basin, the regional stratigraphic correlation, rock dating and combined with the results of previous studies, Reunderstanding of Lishu fault depression of Early Cretaceous evolution, K1 sh1 sedimentary is divided trough, K1 sh2 was gradually formed a unified Lake Basin, the former divided layer into Huoshiling formation on volcano rock should be attributed to the K1 sh1 layer, it developed effective hydrocarbon source rocks. Research on petroleum system as the center of the hydrocarbon source rock, Preliminary exploration has not aroused enough attention, the further exploration in the field of Lishu fault depression should focus on of the layer.
引文
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[2]吉林省煤炭工业管理局地质局112队.营城煤田银矿山南部详查地质报告[R].长春:吉林省地质资料馆,
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[5]杨学林,孙礼文.松辽盆地东南部中生代植物化石与含煤地层划分[R].吉林:吉林煤田地质研究所,1979:1~41.
[6]周尚安,马文奇,邹掌珠.羊草沟煤盆地含煤地层及赋煤特征[J].吉林地质,1985,4(2):1~11.
[7]吉林省地质矿产局.吉林省区域地质志[M].北京:地质出版社,1988:191~199.
[8]杨春志,沈德安.吉林省松辽盆地东缘中生代含煤地层层序划分与对比[J].吉林地质,1986,5(3):50~59.
[9]邢徳和,孙春林等.义县组研究的新认识[J].地球学报,2005,26(1):25~30.
[10]瞿雪姣,王璞珺,姚瑞士等.松辽盆地南部火石岭组地层层序划分与区域对比[J].中南大学学报(自然科学版),2014,45(8):2716-2727.