塔里木盆地东北地区三叠系、侏罗系砂岩的压实作用及其石油地质意义

ON THE SANDSTONE COMPACTION OF JURA-TRIAS SYSTEMS AND THE PETROLEUM GEOLOGICAL SIGNIFICANCE IN THE NORTHEAST TARIM BASIN

王旭 刘树晖 叶德胜 郑维林

Wang Xu Liu Shuhui Ye Desheng Zheng Weilin

西南石油局05工程处 贵阳 550301

No. 05 Project Administration MGMR

塔里木盆地东北地区三叠系、侏罗系砂岩的压实作用普遍而强烈,其中以物理压实为主,化学压实次之。物理压实普遍埋深加大,不一定向化学压实转化。压实作用主要受控于岩石特征、沉积背景及埋藏史。据压实作用的强弱程度,依次把工区的压实作用分为三个级别:Ⅰ级压实、Ⅱ级压实和Ⅲ级压实。压实作用愈强烈愈利于油气生成,但不利于孔隙的保留和产生;压实作用较弱则利于孔隙的保留和产生,能发育良好的储集层,而不利于有机质的转化。

The sandstone compaction of Jura-Trias systems is both widespread and severe in the Northeast Tarim Basin, of which the mechanical compaction predominates the chemical one. The mechanical compaction is generally strengthened along with increasing of burial depth, but not always transformed into chemical compaction. However, the sandstone compaction is mainly dominated by rock property, sedimentary environment and burial history. In accordance with compaction strength, the sandstone compactions in the study area can be divided into three grades of Ⅰ, Ⅱ and Ⅲ respectively. The more severe compaction, the more favourable for oil/gas generation, but unfavourable for the formation and the preservation of pores. Therefore, the weak compaction is favourable for the development of good reservoirs, but disadvantageous to the transformation of organic matter.

https://doi.org/10.11781/sysydz199301049