塔南断陷陡坡带南屯组岩性油藏形成与分布的主控因素

doi:10.7623/syxb201104002

石油学报 ›› 2011, Vol. 32 ›› Issue (4): 564-572.DOI: 10.7623/syxb201104002

塔南断陷陡坡带南屯组岩性油藏形成与分布的主控因素

王显东 1,2,3 贾承造 4 蒙启安 3 张革 3

1中国石油大学油气资源与探测国家重点实验室北京 102249； 2中国石油大学盆地与油藏研究中心北京 102249； 3大庆油田有限责任公司勘探开发研究院黑龙江大庆 163712； 4中国石油学会北京 100724

收稿日期:2010-11-22 修回日期:2011-04-11 出版日期:2011-07-25 发布日期:2011-09-22
通讯作者: 王显东
作者简介:王显东，男，1977年11月生，2001年毕业于西南石油学院石油与天然气地质勘查专业，2004年获石油大学(北京)矿产普查与勘探专业硕士学位，现为中国石油大学（北京）地质学专业在读博士研究生，大庆油田勘探开发研究院工程师，主要从事石油地质与勘探方面的研究工作。
基金资助:
国家科技重大专项（2008ZX05001-001-02）“海塔盆地岩性地层油气藏富集规律与目标评价”部分成果。

Main controlling factors of the formation and distribution of Nantun Formation lithologic reservoirs in the abrupt slope zone, Tanan Sag

WANG Xiandong 1,2,3 JIA Chengzao 4 MENG Qi’an 3 ZHANG Ge 3

Received:2010-11-22 Revised:2011-04-11 Online:2011-07-25 Published:2011-09-22

摘要/Abstract

摘要：

基于地震、钻井、录井、测井及分析化验等资料，对塔木察格盆地塔南凹陷陡坡带南屯组岩性油藏形成与分布的主控因素分析表明，塔南凹陷主裂陷幕发育的南屯组湖进体系域优质烃源岩控制了岩性油气藏的发育层段，烃源岩之下发育的低位体系域砂岩及与烃源岩同期发育的湖进体系域砂体最有利于形成岩性油气藏；塔南凹陷陡坡带表现出了明显的“沟谷控源、断坡控砂”的成盆特点，即同沉积断裂体系活动过程中形成的多方向沟谷控制了沉积物源和扇体走向，而不同类型同沉积断裂组合形成的断裂坡折系统控制了扇体的展布和砂体的分布；陡坡带发育的近岸水下扇扇中亚相为最利于油气储集的亚相相带，最有利于油气储集的微相类型是辫状沟道；储层中含有的凝灰质成分有利于次生孔隙的发育，有效地改善了储层砂岩的储集能力。

关键词: 塔南凹陷;陡坡带, 岩性油藏, 优质烃源岩, 沟谷与断坡, 沉积微相, 次生孔隙

Abstract:

On the basis of seismic, drilling, logging and lab analysis data of the Tanan Sag, Tamsag Basin, analyses of main controlling factors of the formation and distribution of Nantun Formation lithologic reservoirs in its abrupt slope zone indicated that premium source rocks of the Nantun Formation developed in the TST during the primary rifting phase controlled oil-bearing intervals of lithologic reservoirs that were readily formed both in LST sandstones developed beneath the source rock and in TST sandstones developed synchronously with the source rock. The abrupt slope zone of the Tanan Sag obviously showed a character of “a sedimentary source controlled by cleughs” and “a sand distribution controlled by ramps”, namely multi-orientation cleughs formed during activities of the synsedimentary fault system dominated the source of sediments as well as the strike of fans, while the ramp system formed by the combination of various synsedimentary faults controlled the spreading pattern of fans as well as the distribution of sand bodies. The combination was characterized by comb-like and parallel scattering structures on a plane and fault-cliff and fault-terrace structures in a profile. The mid-fan sub-facies of nearshore subaqueous fans showed a good reservoir potential and sandstones in sedimentary microfacies of braided channels were the most advantageous to oil accumulations. Secondary pores formed by dissolution of tuffaceous components in reservoir rocks could effectively improve the storage of reservoir sandstones.

Key words: Tanan Sag, abrupt slope zone, lithologic reservoir, excellent source rock, cleugh and ramp, sedimentary microfacies, secondary pore

王显东贾承造蒙启安张革. 塔南断陷陡坡带南屯组岩性油藏形成与分布的主控因素[J]. 石油学报, 2011, 32(4): 564-572.

WANG Xiandong JIA Chengzao MENG Qi’an ZHANG Ge. Main controlling factors of the formation and distribution of Nantun Formation lithologic reservoirs in the abrupt slope zone, Tanan Sag[J]. Editorial office of ACTA PETROLEI SINICA, 2011, 32(4): 564-572.

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塔南断陷陡坡带南屯组岩性油藏形成与分布的主控因素

Main controlling factors of the formation and distribution of Nantun Formation lithologic reservoirs in the abrupt slope zone, Tanan Sag

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