2012年4月
现代地质 GEOSCIENCE
No.2
Vol 26
Apr.2012
下扬子区印支期后构造演化与有利勘探区预测
李建青"，2，蒲仁海"，田媛媛
（1.西北大学大陆动力学国家重点实验室，西北大学地质学系，陕西西安710069；
2.中国石油化工股份有限公司华东分公司，江苏南京210011）
摘要：通过恢复下扬子区白墨纪末期与古近纪末期的剩蚀厚度及分析印支不整合面Tg°的最大埋深，结合古地温条件得出下扬子区中生界、古生界均发生过晚期生烃和成藏。白垩纪末期，黄桥、旬容和无为地区最大剥蚀厚度分别为1000 m、1500m和800m。古近纪末期，黄桥地区最大剩蚀厚度约450m，句容和无为地区无刹蚀。在3.3℃/100m~4℃/ 100m的古地温梯度下，白墨纪末期，无为地区约70%面积的二叠系一下三叠统烃源岩埋深达到2000~4000m，进人
生油阶段，但未进人生气阶段；句容地区二
营器
的生气阶段：黄桥地区约70%面积的二叠系
三登统经源岩几乎全部进人生油阶段，次凹区进人了4000m以下三叠统经源岩进人生油阶段，主要位于北部深凹区和西部次凹区，凹
陷深处烃源岩进人生气阶段。印支不整合面Tg”自白墨纪末期油气生成以来的多个古鼻凸轴线指示了油气运移路径、方向和聚集区，从喜山期至今的迁移变化指示了有利勘探区。
关键调：下扬子区；剩蚀厚度；构造演化；生烃期；有利勘探区
中图分类号：TE122.3
文献标志码：A
文章编号：10008527(2011)02032607
TectonicEvolutionandPredictionofFavorableProspectingAreaafter
theIndosinianStageinLowerYangtzeRegion
LI Jian-qing'.2, PU Ren-hai', TIAN Yuan-yuan
(1. State Key Laboralory of Continental Dynamics, Department of Geology, Northwest Unieersily, Xian, Shaanri710069, China;
2. East Chine Branch Company, SINOPEC, Nanjing, Jiangiu 210011, China)
Abstract: By recovery of erosion thickness of the latest Cretaceous and the latest Paleogene and the analysis of aaoe source rock have occurred late hydrocarbon generation and accumulation. In the latest Cretaceous, the largest erosion thicknesses of Huangqiao, Jurong and Wuwei areas are 1,000 m, 1,500 m and 800 m. In the latest Pa-leogene,the largest erosion thickness of Huangqiao area is about 450 m,but Jurong and Wuwei areas are not denuded. Under the paleo-geothermal gradient of 3. 3 °C/100 m to 4 °C/100 m, in the latest Cretaceous, the depths of about 70% Permian-Lower Triassic hydrocarbon source rocks are 2,000 m to 4,000 m and have en-tered the oil generation stage under the gas generation stage in Wuwei area; Almost all the Permian-Lower Trias sic hydrocarbon source rocks have entered the oil generation stage in Jurong area, and its sub-sag region with depth below 4, 000 m entering the gas generation stage; In Huangqiao area, about 70% Permian-Lower Trias-sic source rocks reach the oil generation stage, mainly in northerm deep depression and westerm sub-depression, and its deep parts have entered the gas generation stage. Many ancient nose uplift axises in Indosinian uncon-formity Tg° since the latest Cretaceous hydrocarbon generation indicate the hydrocarbon migration paths, directions and accumulation areas, and their changes from Himalayan to the present indicate favorable prospecting areas.
收稿日期：2011-11-09；改回日期：2011-12-12；责任编辑：孙义梅。
基金项目：中国石油化工股份有限公司华东分公司勘探先导性研究项目（G1408-09-KK-0)。
作者简介：牵建青，男，高级.T.程师，博士，1967年出生，矿产替查与勘探专业，主要从事石油地质综合研究。
Email;lijianqing1967@126.com
通信作者：蒲仁海，男，教投，1962年出生，石油地质学专业，主要从事况积学与地覆解释方面的研充。
Email; purenhai@ 126. com