缅甸Shwebo盆地储层研究及勘探方向

HYDROCARBON RESERVOIRS AND EXPLORATION STRATEGIES IN THE SHWEBO SUB-BASIN,MYANMAR

Shwebo盆地勘探多年来,储层是影响勘探成效的关键因素。研究结果表明,Shwebo盆地白垩系—古近系储层主要岩石类型为长石砂岩、石英砂岩及凝灰质砂岩;孔隙类型主要为残余粒间原生孔隙和微裂隙溶蚀孔隙。孔隙结构复杂、非均质性强以及低孔、低渗是储层的主要特征。沉积环境和成岩作用是影响储层质量的主要因素,其中,影响盆地西部岛弧带储层质量的关键因素是火山活动及成岩作用;影响Shwebo盆地内储层质量的关键因素是胶结作用及压实作用,并指出了盆地有利储层勘探区。

In the Shwebo Sub-basin,reservoir has remained the key factor influencing exploration effectiveness for many years.The main rock types of the Cretaceous-Eocene reservoirs are dominated by sand stones,such as feldspar sandstone,quartz sandstone and tuffaceous sandstone with residual intergranular pore and dissolved microfracture pore characterized by complex structure and great heterogeneity.They are low in porosity and permeability,and the quality of reservoirs is determined by their depositional environment and diagenesis.The former includes the depositional system,volcanic activity and provenance,while the latter involves cementation,alteration and compaction.In the island arc in the west of the basin,volcanism and diagenesis are the key factors,while in the internal part of the basin,cementation and compaction dominate.Upon the study of reservoir characteristics,favorable exploration areas are further discussed.