高邮凹陷戴南组断层-岩性油藏断层输导性能及演化

基于高邮凹陷戴南组断层-岩性油藏断层现今与成藏期垂向正应力分析,研究断层垂向封闭性演化规律,并结合断层垂向输导模式划分,预测高邮凹陷戴南组断层-岩性油藏有利分布区。研究结果表明,断层垂向封闭性的临界正应力值为13.8 MPa,多数控藏断层在成藏期开启作为输导通道,现今则封闭成为遮挡条件,但偶有例外,邵深1油藏控藏断层在成藏期与现今皆封闭,此类油藏极有可能是自生自储;高邮凹陷发育有两种垂向输导模式,分别为高通和低通垂向输导模式,其中高通垂向输导模式中戴南组底砂岩发育,低通垂向输导模式戴南组底砂岩不发育。在断层封闭性演化研究和输导模式划分的基础上,认为联12油藏以东-永22油藏以西及邵14油藏以东伯东地区是高邮凹陷戴南组断层-岩性油藏发育的有利区带,邵深1油藏西北的邵伯次凹深处是断层-岩性油藏发育的较有利区带。

Fault Migration Capability and Evolution of Fault-Lithologic Reservoirs of Dainan Formation in Gaoyou Depression

Fault sealing evolution is analyzed based on normal stress calculation,and combined with migration pathway pattern division,and favorable areas of fault-lithologic reservoirs of Dainan Formation are predicted in Gaoyou depression.It is concluded that the critical value of fault sealing is 13.8 MPa.Most of the reservoir faults are open in the accumulation period and closed now.However,there is one reservoir fault sealing all the time,which is Shaoshen 1 reservoir of own source type.Two types of migration pathway patterns were divided in theory which are the high-efficient and the low-efficient types respectively.The high-efficient type developed with bottom sand,while the low-efficient without bottom sand.East Lian 12 oil-west Yong 22 oil and east Shao 14 oil are the most favorable areas of fault-lithologic reservoirs of Dainan Formation in Gaoyou depression.Deep Shaobo sub-sag to the northwest of Shaoshen 1 reservoir is the secondary favorable area.