小草湖洼陷中侏罗统沉积储层研究与勘探建议
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摘要
通过岩心、测井、地震反射特征的观察分析,结合区域地质背景,对小草湖洼陷中侏罗统(J_2s、J_2x)沉积、储层、成岩作用进行了研究,认为该区为一套辫状河、扇三角洲、滨浅湖沉积体系,主要储层砂体为分流河道、水下分流河道、辫状河道砂体,这些储集体具有成分成熟度高、结构成熟度偏低的特点,且大多处于晚成岩作用A1、A2期,为了使勘探取得理想的结果,寻找水下砂体和裂缝发育带应是该区下步油气勘探的方向。
The deposition, reservoir and diageneses of the mid - Jurrassic (J_2s, J_2x) formation were investigated through analyses of core, log and seismic reflection characteristics combined with local geologic settings. It is concluded that there is a set of braid river, fan - delta and coastal shallow lake sedimentary system, where the major reservoir sand is distributary channel and braided channel, with high compositional maturity and relatively low textural maturity, and most of which are in the late diagenesis A1, A2 age. Seeking subaqueous sand and fracture developed belt should be the next exploration step in this area.
The deposition, reservoir and diageneses of the mid - Jurrassic (J_2s, J_2x) formation were investigated through analyses of core, log and seismic reflection characteristics combined with local geologic settings. It is concluded that there is a set of braid river, fan - delta and coastal shallow lake sedimentary system, where the major reservoir sand is distributary channel and braided channel, with high compositional maturity and relatively low textural maturity, and most of which are in the late diagenesis A1, A2 age. Seeking subaqueous sand and fracture developed belt should be the next exploration step in this area.
引文
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