台南凹陷三叠系油气有效输导层特征分析

An Analysis of Triassic Effective Passage Layer Characteristics in Tainan Depression

有效输导层是油气运移过程中实际经过的那部分输导通道。在常规储层物性研究的基础上,分析有效输导层宏观影响因素,结合油气显示数据,研究油气运移过程中流体在储层中的通道优选规律。研究工作显示:吐哈盆地台南凹陷三叠纪储层油气经历了由西向东的长距离运移过程,砂体是主要运移通道。埋藏压实作用是影响输导层物性最重要的因素,同等压实程度下,细砂岩物性最佳,三角洲内前缘和辫状三角洲平原是有利的储层形成环境。应用滑动砂地比连续计算地层砂泥岩分布,85%的油气显示小层分布在滑动砂地比大于60%的地层段内。台南凹陷有效输导层分布于研究区中部和南部,累加有效储层孔隙空间厚度在20~40 m范围。

The effective passage layer is the part of the passage,and Oil and gas actually pass through during process of migration.On the basis of conventional reservoir physical properties,the macro-influencing factors of effective passage layers are analyzed.Combining with oil and gas display data,the optimization rule of fluid channel in reservoir during oil and gas migration is studied.Research work shows that oil and gas which exists in the triassic reservoir in the Tainan sag,Turpan Hami basin experienced a long migration from west to east.Sand body is the main migration channel.Burial compaction is one of the most important factors that affect the physical properties of the passage layer.Under the same degree of compaction,fine sandstone has the best physical properties.The inner front of delta and braided delta plain are favorable reservoir forming environments.In this paperthe distribution of sandstone and mudstone in strata is continuously calculated by using the sliding sand ratio.85%of oil and gas show are distributed in the strata with the ratio of sliding sand ratio greater than 60%.Effective reservoirs in Tainan sag are distributed in the middle and south of the study area.Their accumulated effective reservoir pore space thickness is in the range of 20~40 m.