Characteristics of clay minerals and their effects on production capacity of the Cretaceous sandstone reservoirs of Songliao Basin, China

Clay minerais in Cretaceous sandstone reservoirs of Songliao Basin are mainly composed of smectite, illite, kaolinite, chlorite and mixed-layer smectite/illite (S/I) and smectite/chlorite (S/Ch). Compositions and content of these clay minerals, and their occurrence patterns of in the sandstone pores are mainly controlled by diagenesis and depositional environment. These characteristics may directly influence the pore textures and the production capacity of the reservoirs. In addition, water sensitivity, acid sensitivity, and microgram migration of in situ clay minerals are the most important potential factors leading to formation damage during processes of well drilling, completion, waterflooding and stimulation.Wang Xingxin. Characteristics of clay minerals and their effects on production capacity of the Cretaceous sandstone reservoirs of Songliao Basin, China. In: Proceedings of the 9th international Clay Conference, Strasbourg, 1989. Vol IV : Clays in sediments. Diagenesis and hydrothermalism. Strasbourg : Institut de Géologie – Université Louis-Pasteur, 1990. pp. 105-114. (Sciences Géologiques. Mémoire, 88