中非Melut盆地远源岩性油藏成藏条件与勘探对策

doi:10.3969/j.issn.1672-7703.2017.06.010

摘要/Abstract

摘要： 研究了中非Melut盆地古近系远源岩性油藏形成条件、成藏特征及勘探对策，明确了Melut盆地强烈的断-坳分异现象是盆地发育富砂地层、形成远源成藏的主要原因。古近系Yabus组上段三角洲前缘相带发育，埋深浅、储层物性好、具备形成高产油藏条件，是Melut盆地寻找商业岩性油藏的理想层系。油源条件是古近系远源岩性油藏成藏的关键，由油源断裂控制的各种构造-岩性复合圈闭是有利的圈闭类型。通过油水界面研究和烃类检测技术的应用，选择油水界面超过圈闭溢出点的已发现构造圈闭作为远源岩性及构造-岩性圈闭勘探的初选目标，可降低远源油藏勘探的油源风险，提高钻探成功率。该研究明确了Melut盆地远源岩性油藏勘探层系、控制因素、成藏特征及勘探方法，拓展了北部成熟探区勘探空间，为北部成熟探区古近系远源岩性及构造-岩性复合圈闭的勘探提供了技术支持。

关键词: 中非, Melut盆地, 古近系, 远源岩性油藏, 勘探对策

Abstract: Systematic studies have been carried out on the conditions and characteristics of the Paleogene far-source hydrocarbon accumulation and the exploration strategy in the Melut Basin, Central Africa, and state that the strong differentiation of rifting and sagging is the main controlling factor on the development of the sandstone-rich formations and far-source reservoirs.The delta front facies in the upper Paleogene Yabus Formation is developed with shallow buried depth and good reservoir properties, and favorable for forming high-productivity reservoirs, so it is the ideal target for discovering commercial lithologic reservoirs in the Melut Basin. The oil source condition is the key factor on the Paleogene far-source hydrocarbon accumulation,and the structural-lithologic traps controlled by oil-migrating faults are favorable traps.Based on the study on oil-water contact and hydrocarbon detection, discovered structural traps with oil-water contacts over over-flowing points were selected as initial targets for exploring far-source lithologic and structural-lithologic traps. This may reduce exploration risk and increase drilling success rate. This paper proposes favorable far-source lithologic reservoirs and their controlling factors, accumulation characteristics and exploration technology, expands the exploration field and provides technical support for the exploration of the Paleogene far-source lithologic and structural-lithologic traps in the developed northern exploration block in the Melut Basin.

Key words: Central Africa, Melut Basin, Paleogene, far-source lithologic reservoirs, exploration strategy

中图分类号:

TE112.3

史忠生, 薛罗, 牛慧赟, 王国林, 陈彬滔, 何巍巍, 马轮. 中非Melut盆地远源岩性油藏成藏条件与勘探对策[J]. 中国石油勘探, 2017, 22(6): 87-95.

Shi Zhongsheng, Xue Luo, Niu Huiyun, Wang Guolin, Chen Bintao, He Weiwei, Ma Lun. Accumulation conditions of far-source lithologic reservoirs and exploration strategy in Melut Basin, Central Africa[J]. China Petroleum Exploration, 2017, 22(6): 87-95.

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