石油与天然气地质 ›› 2024, Vol. 45 ›› Issue (3): 722-738.doi: 10.11743/ogg20240311
韩载华1(), 刘华1,2(), 赵兰全3, 刘景东1, 尹丽娟3, 李磊1
收稿日期:
2023-12-24
修回日期:
2024-05-31
出版日期:
2024-06-30
发布日期:
2024-07-01
通讯作者:
刘华
E-mail:1339514178@qq.com;liuhua77@upc.edu.cn
第一作者简介:
韩载华(1994—),男,博士研究生,非常规油气地质。E‑mail: 1339514178@qq.com。
基金项目:
Zaihua HAN1(), Hua LIU1,2(), Lanquan ZHAO3, Jingdong LIU1, Lijuan YIN3, Lei LI1
Received:
2023-12-24
Revised:
2024-05-31
Online:
2024-06-30
Published:
2024-07-01
Contact:
Hua LIU
E-mail:1339514178@qq.com;liuhua77@upc.edu.cn
摘要:
为了揭示渤海湾盆地临南洼陷古近系沙河街组致密(低渗)砂岩油的差异富集机理,在依据空间配置和岩性组合划分源-储组合类型的基础上,综合利用测井、录井、试油和岩心分析测试资料,对不同源-储组合类型含油性及其供烃条件、储集条件、输导条件和运聚动力进行了分析,建立了致密(低渗)砂岩油差异富集模式。结果显示:①研究区存在源-储共生型(夹层型、互层型)、源-储紧邻型(源上型、源间型和源下型)、源-储间隔型(源下型)3大类6亚类源-储组合,对应3种致密(低渗)砂岩油富集模式。②源-储共生型具有“强供烃-强动力-高效充注-储集控富”模式,供烃条件和运聚动力最优,油气通过孔缝高效充注,储层含油性最好;相较于互层型,砂体厚度制约了夹层型油气富集规模。③源-储紧邻型具有“较强供烃-差异动力-联合输导-多元控富”模式,供烃条件较好,运聚动力变化大,油气通过孔缝-断裂-砂体联合输导,优先充注物性和孔隙结构好的储层,储层含油性较好;亚类中,源间型供烃条件和运聚动力优于源上型和源下型,含油性最好。④源-储间隔型具有“弱供烃-弱动力-断砂输导-输储控富”模式,供烃和运聚动力较弱,断裂、砂体组成的有效输导通道和优质储层发育对于油气富集至关重要,含油性整体较差。
中图分类号:
图8
临南洼陷沙三段—沙四段泥页岩与致密(低渗)砂岩储层裂缝特征a.泥页岩层理缝及低角度缝,商741井,埋深3 350.0~3 353.0 m,岩心照片;b.砂岩内高角度缝、斜交缝,源-储紧邻源间型,街503井,埋深3 848.1~3 852.1 m,岩心照片;c.砂岩内高角度缝、斜交缝,源-储紧邻源下型,街4井,埋深3 956.5~3 958.0 m,岩心照片;d.微裂缝内充填沥青,街5井,埋深3 933.6 m,源-储紧邻源间型,单偏光显微镜下照片;e.微裂缝内充填沥青,街5井,埋深3 978.0 m,源-储紧邻源间型,单偏光显微镜下照片;f.砂岩内微裂缝,夏942井,埋深3 800.8 m,源-储紧邻源下型,单偏光显微镜下照片;g.砂岩内微裂缝,夏斜352井,埋深3 826.8 m,源-储共生互层型,扫描电镜照片"
图11
临南洼陷致密(低渗)砂岩储层孔隙发育特征及含油性差异显微照片a.残余粒间孔与次生溶蚀孔发育,内部赋存沥青,街503井,埋深4 047.3 m,源-储紧邻源下型,油浸,单偏光;b.残余粒间孔发育,夏942井,埋深3 800.8 m,源-储紧邻源下型,油斑,扫描电镜;c.镜下孔隙发育较差,夏99井,埋深4 253.2 m,源-储紧邻源下型,油迹,单偏光;d.次生溶蚀孔隙发育,临82井,埋深3 869.6 m,源-储共生夹层型,油浸,单偏光;e.石英晶间孔发育,夏斜352井,埋深3 826.8 m,源-储共生互层型,荧光,扫描电镜;f.孔隙不发育,夏斜961井,埋深3 449.8 m,源-储间隔源下型,无显示,单偏光"
表1
临南洼陷不同源-储组合类型含油性和油气富集条件对比"
源-储组合类型 | 源-储共生型 | 源-储紧邻型 | 源-储间隔型 | |
---|---|---|---|---|
含油性 | 油气显示比例/% | 28.0~100.0 | 9.0~78.0 | 2.5~25.0 |
含油饱和度/% | 22~83 | 17~75 | 2~51 | |
平均日产油量/t | 11.4 | 6.4 | 1.1 | |
供烃条件 | 平均烃源岩厚度/m | 180.6 | 100.9 | 66.9 |
优质烃源岩占比/% | 70.0 | 70.0 | 42.8 | |
运聚动力条件 | 源-储剩余压力差/ MPa | 3.0~16.9 | — | — |
源-储剩余压力梯度/(MPa/km) | — | 18~465 | 5~60 | |
输导条件 | 孔缝输导 | 孔缝-断裂-砂体联合输导 | 断裂-砂体输导 | |
储集条件 | 砂体平均累计厚度/m | 43.8 | 75.7 | 72.9 |
单砂体厚度/m | >5 | 0~6 | 0~6 | |
平均孔隙度/% | 9.6 | 12.5 | 8.5 | |
渗透率中值/( | 0.50 | 0.58 | 0.32 | |
孔隙特征 | 次生溶蚀孔和晶间孔增多 | 残余粒间孔和次生溶蚀孔为主 | 次生溶蚀孔和晶间孔增多 |
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