冀中饶阳凹陷下第三系沙河街组第三段砂岩次生孔隙形成机制

SECONDARY PORE FORMATION MECHANISM OF THIRD MEMBER OF SHAIJEJIE FORMATION,RAOYANG DEPRESSION

张以明 侯方浩 方少仙 朱连儒 陶洪兴

Zhang Yiming Hou Fanghao Fang Shaoxian Zhu Lianru Tao Hongxing

沙河街组第三段砂岩在纵向上存在三个次生孔除发育带,借集空间均以长石的次生溶孔为主.有机质脱羧产生的酸性组分、特定成岩环境中矿物相之间的平衡反应和局部有利的孔隙保存条件,是研究区次生孔除发育和保存的主要原因.结合区域沉积环境、构造特点、埋藏成岩史,预测划分出三个有利地带.

Three developmental zones of secondary pores could be recognized vertically in the 3rd member feldspathic sandstone of the Shahejie Formation.The pore spaces are primarily feldspathic dissolution pores.The acidic composition resulted from organic matter decarboxylation,balance-reactinons between mineral phrases in special diagenetic environment and favourable conservation conditions in local places are the main cause for the development and preservation of the secondary pores in study area.three favourable zones have been divided in prediction according to their depositional environment, structural feature and burial diagenetic history.

10.11743/ogg19940304