珠江口盆地珠海组砂岩模拟溶蚀实验中孔隙变化及其影响因素  

Porosity Variation and Its Influencing Factors in the Sandstone Simulation Dissolution Experiments of Zhuhai Formation in the Pearl River Mouth Basin

作　　者：高耀[1] 伏美燕[1] 朱翔[1] 赖冬[1] 刘磊[1] Gao Yao Fu Meiyan Zhu Xiang Lai Dong Liu Lei(State Key Laboratory of Oil and Gas Geology and Development Engineering, Chengdu University of Technology, Chengdu 610059, China)

机构地区：[1]成都理工大学油气地质及开发工程国家重点实验室,成都610059

出　　处：《地质科技情报》2016年第5期83-87,117,共6页Geological Science and Technology Information

摘　　要：珠江口盆地文昌A凹陷珠海组发育低孔低渗储层,其中次生孔隙十分发育,控制了储层物性,但是该区次生孔隙控制因素不清楚。为了加深了解该区次生孔隙的形成演化过程及其控制因素,通过对文昌区珠海组砂岩岩样薄片进行模拟溶蚀实验来研究孔隙变化,实验过程中利用偏光显微镜、阴极发光仪、图像分析软件等对砂岩薄片溶蚀特征进行观察研究,从而认识该区砂岩次生孔隙发育的控制因素。研究表明,在相对封闭的有机酸环境下,长石和铁方解石共存于一个溶蚀体系中,次生孔隙主要源于铁方解石胶结物的溶蚀,产生大量粒间溶孔,而长石粒内溶孔和粒间溶孔均不太发育;同时反应体系中有机酸浓度越大,铁方解石胶结物的溶蚀现象越明显,形成的溶蚀孔越大。Zhuhai Formation in Wenchang A sag of Pearl River Mouth Basin,contains low porosity and low permeability reservoirs,which are well developed secondary pore,controlling reservoir physical properties,but the secondary pore controlling factors are unclear.In order to deepen the understanding of evolution of the secondary pores and their controlling factors in this area,the pore changes of the sandstone in Zhuhai Formation in Wenchang area were studied by simulating the dissolution experiments.The dissolution characteristics of sandstone were analyzed by using polarized light microscope,cathode light emitting apparatus and image analysis software in the simulation experiment.The controlling factors of the development of the sandstone secondary porosity are obtained in the area.Research shows,in the relatively closed environment of organic acid,ferrocalcite and feldspar coexist in a solution system,and secondary pores are the main source to dissolution pore of ferrocalcite cement,resulting in a large number of intergranular dissolved pores,while particles dissolved pores and intergranular dissolved pores in feldspar are not developed.Meanwhile,organic acid concentration is greater in reaction system,dissolution phenomenon of iron calcite cement is more obvious,and dissolution pores are larger.

关 键 词：珠江口盆地 次生孔隙 珠海组 溶蚀实验 

分 类 号：TE122.221[石油与天然气工程—油气勘探]