石油与天然气地质 ›› 2024, Vol. 45 ›› Issue (1): 81-95.doi: 10.11743/ogg20240106
王冠民1(), 庞小军1,2, 黄晓波2, 张雪芳2, 潘凯2
收稿日期:
2023-09-14
修回日期:
2023-11-02
出版日期:
2024-02-01
发布日期:
2024-02-29
第一作者简介:
王冠民(1969—),男,教授、博士生导师,沉积学和储层地质学。E-mail:wangguanmin@upc.edu.cn。
基金项目:
Guanmin WANG1(), Xiaojun PANG1,2, Xiaobo HUANG2, Xuefang ZHANG2, Kai PAN2
Received:
2023-09-14
Revised:
2023-11-02
Online:
2024-02-01
Published:
2024-02-29
摘要:
为解决渤海海域中-深层重力流砂岩储层物性差异大、优质储层预测较难的勘探难题,基于常规物性、铸体薄片、黏土矿物和地球化学等分析测试手段,结合测井、录井、岩心和地震等资料,研究了渤海海域辽中凹陷古近系东营组三段(东三段)深水重力流砂岩储层的沉积特征及优质储层主控因素。结果表明:渤海海域辽中凹陷东三段重力流的沉积类型为砂质碎屑流,储层以中-低孔、中-低渗为主。储集空间中的粒间溶蚀孔最发育,原生孔次之。中砂岩和粗砂岩储层物性最好,细砂岩次之,粉砂岩较差。控制优质储层发育的关键因素是:①物质基础好,表现为分选好、泥质含量低、富含长石。②东营组早成岩期的快速沉降形成欠压实超压条件,使原生孔隙得以大量保存;超压延长了有机酸的生成时间,为砂岩中的钾长石和方解石等矿物溶解提供了充足的酸性流体。③断层沟通了储层和烃源岩,进一步促进了中-深层储层的溶解作用,有利于大量溶蚀孔的形成。④构造抬升和侧向挤压造成的储层破裂作用又形成了大量裂缝和溶缝带,改善了储层物性。
中图分类号:
图7
辽中凹陷南部东三段砂质碎屑流砂岩储层储集空间类型显微照片a.大量原生孔,孔隙较大,连通性较好,LD10-A-1井,埋深2 767.5 m,铸体薄片,单偏光;b.粒间原生孔和粒间溶蚀孔,少量粒内溶蚀孔,LD10-B-2井,埋深3 243.0 m,铸体薄片,单偏光;c.大量粒间溶蚀孔,少量粒间原生孔和铸模孔,LD10-B-2井,埋深3 627.0 m,铸体薄片,单偏光;d.粒间溶蚀孔为主,粒内溶蚀孔次之,连通性差,LD10-B-3井,埋深3 945.0 m,铸体薄片,单偏光;e.孤立粒间溶蚀孔,破碎带内的破碎颗粒呈条带状分布,LD10-B-6井,埋深3 519.0 m,铸体薄片,单偏光;f.微裂缝,LD10-B-3井,埋深3 719.5 m,铸体薄片,单偏光"
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