溱潼凹陷西斜坡阜三段隐蔽油藏勘探开发一体化实践

doi:10.13809/j.cnki.cn32-1825/te.2021.03.002

摘要/Abstract

摘要：

针对溱潼凹陷西斜坡浅层阜三段构造油藏不发育,深层低渗透油藏效益开发难度大的难点,采用沉积建模技术和波形反演等技术,深化成藏规律研究,评价出浅层阜三段构造—岩性油藏的有利区。自然电位—波形反演技术能清晰刻画5 m左右的砂体。建立溱潼西斜坡阜三段浅湖滩坝沉积—成藏模式,勘探开发一体化研究、部署和实施,发现了南华—仓吉千万吨级优质储量阵地,探井成功率70 %。实施“决策部署、地质工程、组织运行一体化”的建产模式,推进溱潼西斜坡阜三段构造—岩性油藏评价,落实可动用储量1 003×10⁴t,建产能17.5×10⁴t。原油盈亏平衡点由81美元/桶下降至46美元/桶,实现了隐蔽油藏的高效勘探开发。

关键词: 勘探开发一体化, 隐蔽油藏, 薄砂层, 阜三段, 西斜坡, 溱潼凹陷

Abstract:

Aiming at the problems that the structural reservoir of the 3rd member of Funing Formation in the shallow layer of the western slope of Qintong depression is not developed and the benefit development of the deep low permeability reservoir is difficult, the sedimentary modeling technology and waveform inversion technology are adopted to deepen the study on the accumulation rule and evaluate the favorable area of the structural lithologic oil reservoir of the 3rsd member of the shallow Funing Formation. The spontaneous potential-waveform inversion technology can clearly describe the sand body of about five meters. Based on the established sedimentation and reservoir forming mode of shallow lake beach bar in the 3rd member of Funing Formation in the western slope of Qintong, Nanhua-Cangji ten-million-ton high quality reserve position has been found by the integrated research, deployment and implementation of exploration and development, and the exploration well success rate is 70 %. The construction and production mode of “decision-making and deployment, geological engineering, organization and operation integration” has been implemented to promote the structure-lithologic reservoir evaluation of the 3rd member of Funing Formation in the western slope of Qintong, and realize the available reserves of 1 003×10⁴ t and the built the production capacity of 17.5×10⁴ t. The break-even point for crude oil has been reduced from $81/bb1 to $46/bb1, enabling efficient exploration and development of concealed reservoirs.

Key words: exploration and development integration, subtle reservoir, thin sand layer, 3rd member of Funing Formation, west slope, Qintong depression

中图分类号:

TE112

李东海,昝灵,黄文欢,等. 溱潼凹陷西斜坡阜三段隐蔽油藏勘探开发一体化实践[J]. 油气藏评价与开发, 2021, 11(3): 281-290.

Donghai LI,Ling ZAN,Wenhuan HUANG, et al. Exploration and development integration practice of subtle reservoir of 3rd member of Funing Formation in western slope of Qintong depression[J]. Petroleum Reservoir Evaluation and Development, 2021, 11(3): 281-290.

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优化目标	方案设计	优化目标	方案设计
开发层系组合	方案1：Ⅲ4、Ⅲ6分层系开发方案2：一套层系—合注合采开发方案3：一套层系—分注合采开发	单井产能	方案1： 4 t/d 方案2： 5 t/d 方案3： 6 t/d 方案4： 7 t/d 方案5： 8 t/d
注采井型井网	方案1：反九点井网—直井方案2：反七点井网—直井方案3：五点井网—直井方案4：直井排状井网方案5：水平井排状井网方案6：水平井采直井注排状井网方案7：水平井采直井注五点井网	注水时机	方案1：同期注水方案2：弹性开发至90 %p_i时注水方案3：弹性开发至80 %p_i时注水方案4：弹性开发至70 %p_i时注水方案5：衰竭开发
注采井距	方案1： 250 m 方案2： 300 m 方案3： 350 m 方案4： 450 m 方案5： 550 m	注采比	方案1： 0.8 方案2： 0.9 方案3： 1.0 方案4： 1.1 方案5： 1.2