皖南—浙西下古生界碳沥青成因及南方海相“有效烃源岩”问题探讨  

Discussions on Origin of Carbonaceous Asphalt in Lower Paleozoic Strata in Southern Anhui and Western Zhejiang and on Marine Efficiency Source Rocks in Southern China/

作　　者：陈安定[1] 黄金明[1] 杨芝文[1] 翟爱军[1] 吴长祥[1] 

机构地区：[1]中国石化集团公司江苏油田分公司地质科学研究院

出　　处：《海相油气地质》2004年第1期77-83,共7页Marine Origin Petroleum Geology

摘　　要：赋存于皖南—浙西的固体碳沥青分为古油藏裂解碳沥青和古油藏破坏次生充填碳沥青两种类型 ,阐明了两类碳沥青的不同成因机制。重新认定了浙西“康山沥青脉”为碳沥青而不是泥岩。论证了皖南、浙西碳沥青的烃源为下寒武统、中—上奥陶统至下志留统、中—上寒武统等。认为加里东运动—广西事件期间是下扬子盆地相区以下寒武统黑页岩为烃源的油藏形成和部分破坏的主要时期。针对南方的油气勘探 ,提出了只有在晚期成藏中作出贡献的源岩才是“有效烃源岩”的新概念。Lower Paleozoic carbonaceous asphalt exists in many paleo-reservoirs in southern Anhui and western Zhejiang is discussed. These sorts of solid asphalt can be divided into the heat cracking and the secondary filling ones, which formed in different origins. The ”Kanshan asphalt veins” that exists in Kanshan is re-confirmed as a sort of carbonaceous asphalt instead of mudstone that have been recognized in past. It is demonstrated that these sorts of carbonaceous asphalt are derived from three or four hydrocarbon-bearing rocks, including Lower Cambrian, Middle and Upper Ordovician and/or Lower Silurian, and Middle and Upper Cambrian source rocks. The episode of Caledonian -Guangxi movements is account for the main period during which the reservoirs of Lower Cambrian black shale as source rocks experienced constructing and being partly destroyed in the Lower Yangzi basinal region. A new concept is put forward that only source rocks contributing during the period of hydrocarbon generation and late-emplacement can be the efficiency source rocks.

关 键 词：碳沥青 油藏 海相地层 油气勘探 烃源岩 古生界 

分 类 号：TE122.116[石油与天然气工程—油气勘探] P534.4[天文地球—古生物学与地层学]