差异压实作用中的同沉积小断层成因探讨——以高台子地区扶杨油层为例  

Origin of small-scaled syndepositional faults during differential compaction——Taking Fuyang reservoir in Gaotaizi area as an example

作　　者：孟祥超 韦学锐[2] 韩维哲[2] 杨庆杰[2] 李小华[3] 

机构地区：[1]中国石油杭州地质研究所,浙江杭州310023 [2]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [3]青海油田测试公司,青海茫崖816400

出　　处：《大庆石油地质与开发》2007年第6期20-23,共4页Petroleum Geology & Oilfield Development in Daqing

摘　　要：入湖三角洲不同于入海三角洲,重力作用很难造成沉积物大幅度滑动,故同生断层与伴生背斜并不发育。前人做等时地层格架剖面对比前优选骨架井时,已尽量避开目的层断缺井,故对比分析地层厚度变化时更多的从沉积成因分析,不再考虑断层影响。高台子地区扶杨油层低砂泥比,高钙质砂岩含量为差异压实作用的形成提供了条件。由于砂泥岩间差异压实作用和砂、泥岩结合部位薄弱环节的普遍存在,高台子地区扶杨油层沉积期断续分布的叠合透镜状砂体本身为形成小幅度差异压实构造准备了雏型,其边缘也是同生小正断层形成的应力集中部位。从而围绕透镜状砂体形成了较多小型同生正断层。可用于解释类似相域等时旋回厚度的不协调变化。Lacustrine delta is quite different from marine delta, gravitation can hardly create wild -scaled slipping of deposits, so syndepositional faults and associated anticlines are not well developed. For former researchers, when optimizing framework wells before the establishment of equitime formation framework profile correlation, interested zone breakthrough wells were evaded. So, the correlation of formation thickness changes was mainly based on sedimentary origin without the consideration of the effect of faults. The lower sand/mud ratio and high calcareous sandstone content of Fuyang reservoir in Gaotaizi area are favourable for differential compaction. Due to the differential compaction in sand and mudstone and the weak combination in associated parts between sand and mudstone, the coincident lens - shaped sand body .of Fuyang reservoir in Gaotaizi area is the miniature of differential compaction structure, and the brims of the coincident lens - shaped sands are the stress concentration location to form small - scaled syngenesis down fault. Therefore, many small - scaled syngenesis down faults have been generated around the coincident lens - shaped sand body. The research can be used to interpret similar inharmonious thickness variation in isochronic strata correlation.

关 键 词：差异压实作用 同生小正断层 透镜状砂体 沉积成因减薄 沉积-断层减薄 

分 类 号：TE121[石油与天然气工程—油气勘探]