CAJ | 학술논문

通过对西湖凹陷砂岩岩石薄片资料的研究，分析成岩作用过程中长石含量、Q1/(F1+R1)、F1/R1等敏感的矿物指数，并结合水动力学背景、物源特征，探讨了砂岩骨架颗粒横向及垂向差异控制因素。在横向上，由于平湖组至花港组沉积时期西湖凹陷为宽缓地貌、水动力背景相近，砂岩骨架颗粒在东西方向上没有显著变化；砂岩骨架颗粒南北向差异较大，成分成熟度却相似，可能与南北物源差异和铝硅酸盐矿物的溶解影响有关。在纵向上，受物源区距离、堆积速度等方面的差异影响，从平湖组到花港组，砂岩的成分成熟度降低。花港组和平湖组下部地层段长石减少主要与两个主要烃源层的有机酸性流体对长石等铝硅酸盐的溶解作用有关。
통과대서호요함사암암석박편자료적연구，분석성암작용과정중장석함량、Q1/(F1+R1)、F1/R1등민감적광물지수，병결합수동역학배경、물원특정，탐토료사암골가과립횡향급수향차이공제인소。재횡향상，유우평호조지화항조침적시기서호요함위관완지모、수동력배경상근，사암골가과립재동서방향상몰유현저변화；사암골가과립남북향차이교대，성분성숙도각상사，가능여남북물원차이화려규산염광물적용해영향유관。재종향상，수물원구거리、퇴적속도등방면적차이영향，종평호조도화항조，사암적성분성숙도강저。화항조화평호조하부지층단장석감소주요여량개주요경원층적유궤산성류체대장석등려규산염적용해작용유관。
On the basis of sandstone rock data, combined with background information on hydrodynamics and sedimentary sources, this paper analyzes the mineral index for the process of diagenesis including feldspar content, Q1/(F1+R1), and F1/R1, and also examines the controls on the components of sandstone grain framework. In the horizontal dimension, the components of the sandstone grain framework are similar from east to west because the Pinghu and Huagang formations are distributed over a wide and gentle landscape, but there is signiifcant variation in the sandstone grain framework from north to south. This north-south difference is likely to have resulted from variation in sedimentary sources and from the dissolution of aluminum silicate minerals. In the vertical dimension, the compositional maturity of sandstone reduces from the Pinghu Formation to the Huagang Formation as a result of the changing distance from the source area and the rate of sedimentation. In addition, the percentage of feldspar decreases in the lower parts of the Pinghu and Huagang formations, owing to the dissolution of both feldspar and aluminum silicates. This dissolution may have been caused by the inlfuence of organic acidic lfuids of two major hydrocarbon source beds.