松辽盆地徐家围子断陷白垩系沙河子组深层致密气成藏机理及勘探突破

doi:10.3969/j.issn.1672-7703.2024.01.010

摘要/Abstract

摘要： 松辽盆地徐家围子断陷沙河子组砂砾岩埋深大、岩性致密，目前对其成藏控制因素认识不足，且受投资成本和勘探开发技术的制约，沙河子组一直未能实现储量和产量的突破。使用地震、岩心、测井、录井及地质分析化验资料，从煤系烃源岩生烃潜力、致密砂砾岩展布、储集物性、地层超压等方面分析了沙河子组致密气成藏控制因素，力图寻找富气甜点、指导井位部署。结果表明，沙河子组储层与烃源岩叠置，致密非浮力成藏动力过程致使异常高压的出现，并造就了满盆含气的格局。沙河子组致密砂砾岩储层在纵横向上叠置发育，储层内部发育的多层高孔渗带成为致密砂砾岩气藏的“甜点”。在致密气成藏理论的指导下，精准刻画了优质富气“甜点”的分布并设计了最优气井轨迹，充分发挥地质工程一体化优势，以优快钻井和最优改造体积为目标，部署了宋深9-平5井，测试产量达106×10⁴m³/d，取得了沙河子组致密气藏的重大突破，为后期松辽盆地沙河子组致密气藏勘探开发带来了广阔的前景。

关键词: 松辽盆地, 沙河子组, 致密气藏, 产能突破, 资源潜力

Abstract: The glutenite in Shahezi Formation in Xujiaweizi Fault Depression in Songliao Basin has a large burial depth and tight lithology. At present, due to the insufficient understanding of controlling factors for hydrocarbon accumulation, and limited by investment cost and exploration and development technology, no breakthrough has been achieved in reserves and production in Shahezi Formation. By using seismic, core, wireline logging, mud logging and experimental data, the controlling factors for tight gas accumulation in Shahezi formation are analyzed from aspects of hydrocarbon generation potential of coal measure source rocks, distribution of tight glutenites, reservoir physical properties and formation overpressure, so as to identify gas sweet spots and guide well location deployment. The study results show that the reservoir and source rock in Shahezi formation are superimposed, and the non-buoyancy dynamic process during the accumulation of tight gas leads to the occurrence of abnormal high pressure and the pattern of gas-bearing in the entire basin. The tight glutenite reservoirs in Shahezi Formation are superimposed vertically and laterally, and multi-layer high porosity zones in the reservoir serve as the “sweet spot” of tight glutenite gas reservoir. Guided by the tight gas accumulation theory, the distribution of high-quality gas “sweet spot” has been accurately characterized and the optimal well trajectory has been designed. By giving full play to the advantage of geology and engineering integration, and aiming at the optimal and fast drilling operation and maximum reservoir reconstruction volume, a well Songshen 9-Ping 5 has been deployed, and the gas rate of 106×10⁴ m³/d has been tested, marking a major breakthrough in tight gas reservoir in Shahezi Formation, which brings broad prospects for the future exploration and development of tight gas reservoir in Shahezi Formation in Songliao Basin.

中图分类号:

TE112.1

姜洪福, 艾鑫, 罗光东, 耿长喜, 王延志, 李召兵, 李文龙, 余文学, 陈建国, 宫秀坤, 杨炜华, 郭晶, 陈海滨. 松辽盆地徐家围子断陷白垩系沙河子组深层致密气成藏机理及勘探突破[J]. 中国石油勘探, 2024, 29(1): 130-141.

Jiang Hongfu, Ai Xin, Luo Guangdong, Geng Changxi, Wang Yanzhi, Li Zhaobing, Li Wenlong, Yu Wenxue, Chen Jianguo, Gong Xiukun, Yang Weihua, Guo Jing, Chen Haibin. Hydrocarbon accumulation mechanism and exploration breakthrough of deep tight gas in the Cretaceous Shahezi Formation in Xujiaweizi Fault Depression, Songliao Basin[J]. China Petroleum Exploration, 2024, 29(1): 130-141.

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