江陵凹陷八岭山—花园多层系盐和盐泥构造及其形成机制
|
摘要
近年来在八岭山-花园背斜构造翼部有新的油气发现,有必要对其构造性质进行再认识。通过地震解剖,认为渔洋组-新沟嘴组(K2y-Ex)有盐和盐泥两类构造叠置,可进一步划分为盐丘-盐柱多层叠置构造、盐泥丘-盐泥株(柱)构造和盐泥丘构造;盐泥构造的形成是塑化的盐泥岩顺层蠕动使每一单层变厚、多层累加增厚的叠加效应结果,盐泥沿早期断层侵入或底辟导致逆断层的产生,使断层具有下正上逆的特点;差异负荷和火山热对流为其主导动力学机制;渔洋组-沙市组下段(K2y-Es下)盐丘-盐柱产生期为中始新世,主要形成期为晚渐新世,沙市组上段-新沟嘴组(Es上-Ex)盐泥构造产生期为晚渐新世,两者均于更新世基本定型;盐泥构造翼部地层-盐泥封挡和上倾尖灭岩性-盐泥封挡圈闭为潜在的油气藏勘探类型。
New discovery of oil and gas in the flank of Balingshan-Huayuan anticline structure in the recent years makes it necessary to have a further understanding of its structural nature. Based on the interpretation of seismic profiles,it is considered that K2 y-Ex is the superimposition of salt and mud tectonics,and can be divided into salt dome-salt pillar multi-layered superimposed structure,salt mud dome-salt mud pillar structure and salt mud dome structure. The formation of salt mud tectonics was the superposition effect of plasticized salt mud stone bedding creep which led to thickening of the single layer and the multi-layer cumulation. Reverse fault was formed by the salt mud intrusion along the early hanging wall of fault and the diapirism,thus the fault had the characteristics of the upper bed showing reverse and the lower showing normal. Differential loading and volcanic thermal convection were the dominant dynamic mechanisms. The salt dome-salt pillar of K2 y-Lower Es occurred at the Middle Eocene with the main formation stage of the Late Oligocene,the salt mud tectonics of upper Es-Ex occurred at the Late Oligocene,and both of them finalized basically in Pleistocene. The salt mud tectonic wing stratasalt mud sealing barrier trap and the lithologic updip pinch out-salt mud sealing barrier trap are the potential oil and gas reservoir exploration types.
New discovery of oil and gas in the flank of Balingshan-Huayuan anticline structure in the recent years makes it necessary to have a further understanding of its structural nature. Based on the interpretation of seismic profiles,it is considered that K2 y-Ex is the superimposition of salt and mud tectonics,and can be divided into salt dome-salt pillar multi-layered superimposed structure,salt mud dome-salt mud pillar structure and salt mud dome structure. The formation of salt mud tectonics was the superposition effect of plasticized salt mud stone bedding creep which led to thickening of the single layer and the multi-layer cumulation. Reverse fault was formed by the salt mud intrusion along the early hanging wall of fault and the diapirism,thus the fault had the characteristics of the upper bed showing reverse and the lower showing normal. Differential loading and volcanic thermal convection were the dominant dynamic mechanisms. The salt dome-salt pillar of K2 y-Lower Es occurred at the Middle Eocene with the main formation stage of the Late Oligocene,the salt mud tectonics of upper Es-Ex occurred at the Late Oligocene,and both of them finalized basically in Pleistocene. The salt mud tectonic wing stratasalt mud sealing barrier trap and the lithologic updip pinch out-salt mud sealing barrier trap are the potential oil and gas reservoir exploration types.
引文
[1]贾承造,赵文智,魏国齐,等.盐构造与油气勘探[J].石油勘探与开发,2003,17(3):17-19.
[2]戈红星,Jackson M P A.盐构造与油气圈闭及其综合利用[J].南京大学学报,1996,32(4):640-649.
[3]周玉琦,周荔青,郭念发.中国东部新生代盆地油气地质[M].北京:石油工业出版社,2004:204-212.
[4]谢泰俊,祁左明,朱振东.江汉盆地的盐构造及其对油气的控制作用[J].石油勘探与开发,1983,4(6):1-8.
[5]Jackson M P A,Talbot C J.A Glossary of Salt Tectonics[M].Austin:The University of Texas at Austin,Bureau of Economic Geology Geological Circular,1991:91-94.
[6]陈书平,汤良杰,漆家福,等.盐在变形中的作用:库车坳陷与东濮坳陷盐构造对比研究[J].地质学报,2007,81(6):745-754.
[7]张洁,尹宏伟,徐士进.用离散元方法讨论岩石强度对主动底辟盐构造断层分布模式的影响[J].南京大学学报,2008,44(6):642-651.
[8]张洁,尹宏伟,孟令森,等.主动底辟盐构造的二维离散元模拟[J].地球物理学进展,2008,23(6):1924-1930.
[9]Trusheim F.Mechanism of salt migration in northern Germany[J].AAPG Bulletin,1960,44(9):256-263.
[10]刘晓峰,解习农,张成,等.东营凹陷盐-泥构造的样式和成因机制分析[J].地学前缘,2005,12(4):403-409.
[11]杨长清,陈孔全,程志强,等.江陵凹陷形成演化与勘探潜力[J].天然气工业,2003,23(6):51-54.
[2]戈红星,Jackson M P A.盐构造与油气圈闭及其综合利用[J].南京大学学报,1996,32(4):640-649.
[3]周玉琦,周荔青,郭念发.中国东部新生代盆地油气地质[M].北京:石油工业出版社,2004:204-212.
[4]谢泰俊,祁左明,朱振东.江汉盆地的盐构造及其对油气的控制作用[J].石油勘探与开发,1983,4(6):1-8.
[5]Jackson M P A,Talbot C J.A Glossary of Salt Tectonics[M].Austin:The University of Texas at Austin,Bureau of Economic Geology Geological Circular,1991:91-94.
[6]陈书平,汤良杰,漆家福,等.盐在变形中的作用:库车坳陷与东濮坳陷盐构造对比研究[J].地质学报,2007,81(6):745-754.
[7]张洁,尹宏伟,徐士进.用离散元方法讨论岩石强度对主动底辟盐构造断层分布模式的影响[J].南京大学学报,2008,44(6):642-651.
[8]张洁,尹宏伟,孟令森,等.主动底辟盐构造的二维离散元模拟[J].地球物理学进展,2008,23(6):1924-1930.
[9]Trusheim F.Mechanism of salt migration in northern Germany[J].AAPG Bulletin,1960,44(9):256-263.
[10]刘晓峰,解习农,张成,等.东营凹陷盐-泥构造的样式和成因机制分析[J].地学前缘,2005,12(4):403-409.
[11]杨长清,陈孔全,程志强,等.江陵凹陷形成演化与勘探潜力[J].天然气工业,2003,23(6):51-54.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心