珠江口盆地砂岩疏松主控因素分析--以恩平凹陷M油田新近系韩江组地层为例  

MAIN CONTROLLING FACTORS OF UNCONSOLIDATED SANDSTONE IN PEARL RIVER MOUTH BASIN:A Case Study of Neogene Hanjiang Formation in M Oilfield of Enping Sag

作　　者：梁卫 闫正和 谢明英 陈一鸣 闫百泉[2] 文慧俭[2] LIANG Wei;YAN Zheng-he;XIE Ming-ying;CHEN Yi-ming;YAN Bai-quan;WEN Hui-jian(Shenzhen Branch of CNOOC(China)Co.,Ltd.,Shenzhen 518000,Guangdong Province,China;Sanya Offshore Oil and Gas Research Institute,Northeast Petroleum University,Sanya 572024,Hainan Province,China)

机构地区：[1]中海石油(中国)有限公司深圳分公司,广东深圳518000 [2]东北石油大学三亚海洋油气研究院,海南三亚572024

出　　处：《地质与资源》2023年第3期335-344,共10页Geology and Resources

基　　金：国家自然科学基金项目“基于密集取心井构型分析及砂体匹配模式控剩余油模拟”(41772149);中海石油(中国)有限公司重大课题“南海东部油田上产2000万吨关键技术研究”(CNOOC-KJ135ZDXM37SZ03SZ)

摘　　要：珠江口盆地恩平凹陷新近系浅层砂岩存在疏松现象,开发过程中出砂问题严重,为油田高效开采带来了很大的困难.通过对恩平凹陷M油田韩江组地层的沉积成因、成岩作用及油气充注期次的研究,揭示了砂岩疏松的主要控制因素,为后续根据属性情况进行井位调整等生产措施奠定了基础.研究结果表明,韩江组砂岩疏松的控因有3方面:一是研究区韩江组属于三角洲前缘沉积环境,粒度细,泥质含量高,不利于胶结成岩;二是成岩程度弱,属于早成岩A期,胶结程度弱;三是油气充注严重抑制了成岩作用.The unconsolidated Neogene shallow sandstone in Enping Sag of Pearl River Mouth Basin causes severe sand production in the development process and brings great difficulties to the efficient exploitation of oil fields.Through the study of sedimentary origin,diagenesis and oil-gas charging period of Hanjiang Formation in M Oilfield of Enping Sag,the paper reveals the main controlling factors of unconsolidated sandstone,which lays a foundation for subsequent production measures such as well location adjustment according to attributes.The results show that there are three controlling factors contributed to the unconsolidated sandstone as follows:1)Hanjiang Formation in the study area is of delta front sedimentary environment with fine grain size and high mud content,which is not conducive to cementation;2)the diagenetic degree is low,belonging to stage A of early diagenesis,with poor cementation;and 3)the diagenesis is severely inhibited by oil-gas charging.

关 键 词：珠江口盆地 恩平凹陷 韩江组 疏松砂岩 成岩作用 

分 类 号：P618.13[天文地球—矿床学]