盆1井西凹陷三工河组储层特征与形成机理

Reservoir Characteristics and Formation Mechanism of Sangonghe Formation in the Sag West of Well Pen-1

马聪 周军军 胡亮 齐婧 吴海光

MACong ZHOUJunjun HULiang QIJing WUHaiguang

中国石油砾岩油气藏勘探开发重点实验室, 新疆 克拉玛依 834000 新疆维吾尔自治区砾岩油藏重点实验室, 新疆 克拉玛依 834000 中国石油新疆油田公司实验检测研究院, 新疆 克拉玛依 834000 东北石油大学地球科学学院, 黑龙江 大庆 163318

Key Laboratory of Conglomerate Reservoir Exploration and Development, CNPC, Karamay, Xinjiang 834000, China Key Laboratory of Conglomerate Reservoir in Xinjiang, Karamay, Xinjiang 834000, China Experiment and Testing Institute, Xinjiang Oilfield Company, CNPC, Karamay, Xinjiang 834000, China School of Geosciences, Northeast Petroleum University, Daqing, Heilongjiang 163318, China

针对盆1井西凹陷三工河组二段（J）深层特殊的坡折带高颗粒含量密度流砂体的沉积特征和优质储层形成机理，系统开展岩芯、普通薄片和铸体薄片观察，扫描电镜、电子探针分析以及碳氧同位素测试。结果表明，盆1井西凹陷三工河组二段深层高颗粒含量密度流沉积砂体包含块状含泥砾细砾岩、块状含砾粗砂岩、块状粗砂岩、块状中-细砂岩、层状细砂岩和泥岩或粉砂岩等6种不同的岩性。其中，块状含砾粗砂岩、块状粗砂岩和块状中-细砂岩物性最好，发育大量的剩余粒间孔和溶蚀孔隙。由单一绿泥石组成的“黏土矿物膜”和由绿泥石和菱铁矿共同组成的“复合矿物膜”普遍发育于优质储层中，有效地抑制了石英的次生加大，使得砂体在深埋藏下原生孔隙得以保存。后期有机酸等流体的溶蚀作用对储层质量的改善也有一定的积极意义。

In this study, the sedimentary characteristics and the formation mechanism of the high-quality reservoir of the sandy debris flow sandbody were investigated. The systematic core, ordinary section and cast section observation, scanning electron microscopy (SEM) and electron probe analysis, and carbon and oxygen isotope measurement were carried out. The results show that the J sandy debris flow in the sag west of Well Pen-1 contains six different lithologies: Massive fine conglomerate with mud-gravel, massive coarse sandstone with gravel, massive coarse sandstone, massive medium-fine sandstone, stratified fine sandstone and mudstone (or argillaceous siltstone). The physical properties of massive coarse sandstone with gravel, massive coarse sandstone, and massive medium-fine sandstone are the best because they contain a large number of residual intergranular pores and dissolution pores. The “clay mineral coating” composed of single chlorite and the “composite mineral coating” composed of both chlorite and siderite are generally developed in the high-quality reservoirs, which effectively inhibits the secondary increase of quartz and preserves the primary pores in the deep burial process. The dissolution of organic acids and other fluids in the late period also has some positive significance for the improvement of reservoir quality.

10.11885/j.issn.1674-5086.2021.04.21.01