摘要
在岩心观察、薄片鉴定的基础上,结合区域地质、钻井、测井以及地震资料,查明了准噶尔盆地吉木萨尔凹陷二叠系梧桐沟组储集岩的主要特征:低和极低的成分成熟度、低—中等结构成熟度、极低—较低的胶结物含量、自生矿物种类较多但含量低。在此基础上,确定了研究区的物源方向以东南部为主、南部和北部为辅,并对梧桐沟组一段3个砂层组、梧桐沟组二段3个砂层组的沉积相进行了研究,绘制了各砂层组的沉积相平面图。由梧桐沟组一段三砂组到梧桐沟组二段二砂组,研究区总体上表现为一个明显的水进沉积过程:辫状河三角洲平原亚相范围缩小,滨浅湖亚相范围扩大;沉积物由粒度较粗的含砾砂岩、粗砂岩等过渡到粒度较细的细砂岩、泥质砂岩等;沉积物供给量减少,砂体厚度逐渐减薄。
On the basis of ore observation,thin section identification,combed with the regional geology,drilling,logging and seismic materials,we figured out the petrology characteristics of the reservoirs in the Permian Wutonggou Formation in Jimusaer Sag,east of Junggar Basin:low or extremely low component maturity,low-middle textural maturity,extremely low-slightly low content of cements and various types of authigenic minerals whose contents are low.On this basis,we made sure that the provenance is mainly located on the southeast of this region,the south and north are secondary.At the same time,we did some research on sedimentary facies of three sandstone groups in the 1~(st) and 2~(nd) members in the Wutonggou Formation,and drew sedimentary facies plane graph of each sandstone group.From Member 1~(st),body 3~(rd) to member 2~(nd),body 2~(nd) in the Wutonggou Formation,the study-area showed an obvious water progradation deposition process on the whole.Braided river delta plain subfacies decrease,lakeside subfacies increase;sediments transmit from pebbly sandstone,coarse sandstone to fine sandstone,argillaceous sandstone with fine grain size.The supply of sediments decreases and the thickness of sandstone body reduces.
引文
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