苏丹Fula油田油藏地质特征

doi:10.11743/ogg20040614

摘要/Abstract

摘要：

苏丹穆格莱德盆地Fula油田主要为较浅的白垩系Aradeiba组、Bentiu组的普通稠油油藏和Abu Gabra组的稀油及天然气藏。主体区块FulaNorth断块Bentiu组油藏为一垒块上的断背斜块状油藏,具有倾斜的油水界面。Aradeiba组为浅湖沉积的层状薄砂岩的高孔、高渗储层,Bentiu组为辫状河沉积的厚层块状砂岩的高孔、高渗储层,Aradeiba组和Bentiu组油藏埋藏浅,砂岩胶结疏松、物性好、易出砂、地层压力低,原油具有密度大、粘度高、酸值高和油稠等特点。Abu Gabra组的层状油气藏为三角洲前缘沉积砂岩、厚度薄、中孔、中渗、物性差,具有断块小、储层相变快、油气高度低等特点。Abu Gabra组油藏的形成主要受侧向封堵条件、储层的储集性等地质条件控制;有效的生、储、盖组合、泥岩的侧向封堵是Darfur群、Bentiu组油藏最主要的控制因素。

关键词: 穆格莱德盆地, Fula油田, 地质特征, 稠油

Abstract:

Fula oilield in Muglad basin, Sudan, is mainly consisted of shallow ordinary heavy oil reservoirs in Cretaceous Aradeiba and Bentiu Formations and light oil and gas reservoirs in Cretaceous Abu Gabra Formation. The reservoir in Bentiu Formation in the major Fula North Block is a faulted anticlinal massive reservoir in a horst block with a dipping oil water contact. In the Aradeiba Formation there are shallow lake facies thin sandstone reservoirs with high porosity and permeability. While braided river facies thick bedded massive sandstone reservoirs with high porosity and permeability are developed in the Bentiu Formation. The Aradeiba and Bentiu reservoirs are characterized by shallow burial depth, loose consolidation, good poroperm characteristics, high sand production and low formation pressure, and the crude oils are characterized by high density, high viscosity, high acid value and heavy oil. The layered reservoirs in Abu Gabra Formation are of delta front facies thin sandstone reservoirs with medium porosity and medium permeability, being characterized by small fault block, rapid facies change and low hydrocarbon column. The oil and gas accumulations in Abu Gabra Formation are mainly controlled by lateral sealing conditions and poroperm characteristics of the reservoirs. Effective source-reservoir-cap rock combination, and lateral blocking of mudstones are the main control factors of oil and gas accumulations in Darfur Group and Bentiu Formation.

Key words: Muglad basin, Fula oilfield, geological feature, heavy oil

中图分类号:

TE111.2

聂昌谋,陈发景,白洋,等. 苏丹Fula油田油藏地质特征[J]. 石油与天然气地质, 2004, 25(6): 671-676. doi: 10.11743/ogg20040614 Nie Changmou,Chen Fajing,Bai Yang,et al. Geological characteristics of Fula oilfield in Muglad basin, Sudan[J]. Oil & Gas Geology, 2004, 25(6): 671-676. doi: 10.11743/ogg20040614

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苏丹Fula油田油藏地质特征

Geological characteristics of Fula oilfield in Muglad basin, Sudan

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