• 油气地质 •

### 埃及西沙漠盆地中生界烃源岩特征及剩余资源分布

1. 中国石化 国际石油勘探开发有限公司, 北京 100029
• 收稿日期:2019-08-05 出版日期:2020-04-01 发布日期:2020-04-03
• 作者简介:杨晓兰(1973-),女,博士、高级工程师,油气田勘探与评价。E-mail:xiaolanyang.sipc@sinopec.com
• 基金资助:
中国石油化工集团项目(P16001);国家自然科学基金项目(41372144)

### Geochemical characteristics of the Mesozoic source rocks and the remaining resources in the Western Desert Basin, Egypt

Xiaolan Yang()

1. International Petroleum Exploration and Production Corporation, SINOPEC, Beijing 100029, China
• Received:2019-08-05 Online:2020-04-01 Published:2020-04-03

Abstract:

The West Desert Basin is one of the three major hydrocarbon-bearing areas in Egypt, with a large number of oil and gas fields discovered therein.At the middle stage of exploration and discovery now, the risk of preliminary prospecting increases.The study focuses on the quantitative analysis of remaining resource potential by basin numerical simulation technology following the detailed evaluation of geochemical characteristics of the source rocks.The results show that the dark shale of coal measures in the Safa and Zahra members of the Middle Jurassic Khatatba Fm and that of the AR-F member in the Upper Cretaceous Abu Roash Fm are the three sets of major source rocks in the basin; and the source rocks are widely distributed in each depression with the thickness varying greatly.The source rocks in the Khatatba Fm have a TOC content ranging from 0.5% to 10% and a high content of cracked hydrocarbon S2, thus are fair-to-very good source rocks.While the AR-F source rocks in the Abu Roash Fm have a TOC content varying between 0.5% and 3% and a moderate-to-high content of cracked hydrocarbon S2, thus belong to fair-to-good source rocks.The kerogen of these source rocks is dominated by mixed Type II, followed by Type III and minor Type I.It is pointed out that the two sets of source rocks in the Khatatba Fm within the whole basin are at the thermal evolution stage of hydrocarbon generation and expulsion in a large amount; that in the center of the depression reaches high mature stage and even over mature stage locally, with oil and gas co-generated.As for the AR-F section of the Abu Roash Fm, only the source rocks in Abu Gharadig and Natrun Sags enter the mature stage of hydrocarbon generation.It is suggested that the hydrocarbons in the northern part of the basin are mainly contributed by the source rocks of the Jurassic Khatatba Fm, while those in the southeastern part are supplied by source rocks in both the Jurassic Khatatba Fm and the Cretaceous AR-F section.The calculation shows that the remaining volume of recoverable resources in the basin reaches up to 6.51 x 108t, indicating huge resource potential.The Paleozoic, Jurassic and Lower Cretaceous AEB in the Abu Gharadig Sag in the south, and the Paleozoic in the Matruh Sag and the Upper Cretaceous in the Faghur Sag in the north, are low in exploration maturity and high in remaining resource potential, thus being favorable targets for future exploration.