CAJ | 학술논문

科特迪瓦-加纳转换边缘是世界上典型的转换型边缘,沿边缘不同区段形成了伸展型边缘(阿比让-三尖角区.阿克拉-贝宁区段)和转换型边缘(三尖角-阿克拉区段),表现为不同的边缘形态、结构、构造特征,沿罗曼彻转换断成了隆升很高的科特迪瓦一加纳边缘脊.转换边缘经历了前转换、同转换和后转换阶段等,不同构造阶段控制了不造样式和沉积特征.阿比让盆地和贝宁盆地边缘的陆架较窄、斜坡很宽、盆地范围较广,发育比较明显的沉积中心,了前转换阶段、同转换阶段海相、非海相和浊流沉积,烃源岩成熟度高,而加纳台地区边缘陆架较宽、斜坡陡峻,没有明显的沉积中心,沉积负载较小,古生代泥盆系烃源岩也只部分成熟.据沉积分布、构造特征及烃源岩成熟度等方面分析,阿比让盆地和贝宁盆地的半深水-深水区为最佳勘探前景地区,加纳台地区应当重视古生代-早白垩世早期气藏.图4参20
과특적와-가납전환변연시세계상전형적전환형변연,연변연불동구단형성료신전형변연(아비양-삼첨각구.아극랍-패저구단)화전환형변연(삼첨각-아극랍구단),표현위불동적변연형태、결구、구조특정,연라만철전환단성료륭승흔고적과특적와일가납변연척.전환변연경력료전전환、동전환화후전환계단등,불동구조계단공제료불조양식화침적특정.아비양분지화패저분지변연적륙가교착、사파흔관、분지범위교엄,발육비교명현적침적중심,료전전환계단、동전환계단해상、비해상화탁류침적,경원암성숙도고,이가납태지구변연륙가교관、사파두준,몰유명현적침적중심,침적부재교소,고생대니분계경원암야지부분성숙.거침적분포、구조특정급경원암성숙도등방면분석,아비양분지화패저분지적반심수-심수구위최가감탐전경지구,가납태지구응당중시고생대-조백성세조기기장.도4삼20
The C(o)te d' Ivoire-Ghana transform margin is a typical transform margin in the world.The extended margin(e.g.Abidjan-Cape Three Points and Aecra-Benin segments)and transform margin(e.g.Cape Three Points-Accra segment)are present in this margin which have different evolution histories and structures.Along the Romanche Transform Fault was formed the high-uplifted C(o)te d' Ivoire-Ghana Margin Ridge.The transform margin experienced pre-transform,syn-transform and post-transform stages,and structures in different stages controlled their respective styles and sediments.In the Abidjan and Benin basins,the shelf is narrower and the slope wider,obvious depocenters are formed with thick marine,non-marine and turbidity current sediments in the pre-transform and syn-transform stages,and the maturity of hydrocarbon sources is higher.In the Ghana platform margin,the shelf is wider and the slope steeper,there isn't any obvious depocenter.The sediment load in this margin is small,and the maturity of hydrocarbon sources(even the Palaeozoic source)is low.The bath、ral and deep sea in the Abidjan and Benin basins is the most attractive area for hydrocarbon exploration.The exploration in the Ghana platform margin should focus on Palaeozoic to Early Cretaceous reservoirs.