渤海湾盆地某凹陷有效烃源岩评价  

Evaluation of effective source rock in a certain depression of the Bohai bay basin

作　　者：刘顺宇[1] 赵荣[1] 王朋岩[1] LIU Shunyu;ZHAO Rong;WANG Pengyan(Geoscience College,Northeast Petroleum University,Daqing Heilongjiang 163318,China)

机构地区：[1]东北石油大学地球科学学院,黑龙江大庆163318

出　　处：《石油化工应用》2018年第12期74-78,91,共6页Petrochemical Industry Application

基　　金：国家科技重大专项;项目编号:2011ZX05028-002

摘　　要：为了弥补沙河街组有效烃源岩方面研究的不足,以渤海湾盆地某凹陷的沙三段及沙四段烃源岩为例,利用24口探井的TOC、S1等地化数据并结合生、排烃史进行有效烃源岩的评价,结果发现:(1)研究区烃源岩生、排烃过程可分为4个阶段和2个临界深度,未熟阶段、生油门限、生油阶段A、生油阶段B、排烃门限、排烃阶段;(2)研究区有效烃源岩类型是Ⅰ和Ⅱ1型,对应的TOC下限分别是2.8%、1.8%,对应的岩性分别是深灰色泥岩、油页岩和深灰色、灰色泥岩,同时还要满足Ro大于0.6%;(3)凹陷的生、排烃能力最强,凹陷周边仅以生烃为主,微弱排烃,斜坡微弱生烃,几乎不排烃,Ⅰ型生、排烃能力最强,Ⅱ1型生、排烃能力有限,Ⅱ2型生、排烃能力最弱。In order to make up for the research lack of Shahejie formation, take the source rocks in Sha-3 member and Sha-4 member in a certain depression in the Bohai bay basin,take advantage of TOC, S1 and other geochemical data and combine with the history of hydrocarbon generation and expulsion to evaluating effective source rock.(1)The process of hydrocarbon generation and expulsion can be divided into 4 stages and 2 critical depths.(2)The types of effective source rocks are type Ⅰ and type Ⅱ1, corresponding lower limits of TOC are respectively 2.8 % and 1.8 %,corresponding lithology is dark gray mud and gray mud and meanwhile Ro exceeds 0.6 %.(3)The capacity of hydrocarbon generation and expulsion of the depression is best, around depression takes second place and the slope is the poorest. The capacity of hydrocarbon generation and expulsion of type Ⅰ is best, type Ⅱ1takes second place and type Ⅱ2 is the poorest.

关 键 词：渤海湾盆地 沙三段 有效烃源岩 生、排烃史 

分 类 号：TE122.11[石油与天然气工程—油气勘探]