Most pores of the Donghe sandstones in central Tarim were primary secondary hybrid. The generation of secondary porosities was related to the acid water from the maturation of source rocks in the northern and southern depressions of the Tarim Basin. The porosity evolution was controlled by structure outline and structure evolution throughout the geohistory. The Tazhong No.1 Fault was a main migration channel for acid water from source rocks to reservoirs. The paleostructural outline and evolution restricted the migration path and direction of acid water, and finally determined the positions of dissolution and the distribution of secondary pores. The quality of the reservoirs which situated at the structure high in long period was superior to the quality of the reservoirs in short period structure high. The emplacement of hydrocarbon in the structure high resulted in the porosities(including both the primary and secondary ones)preserved, and the later tectonic events caused the hydrocarbon accumulated in the reservoirs to discharge. At the same time, the porosities were occupied by hydrocarbon before they were released again and filled by later carbonate cements.
Zhong Dakang,Zhu Xiaomin,Zhou Xinyuan et al. EFFECT OF STRUCTURE ON SANDSTONE’S POROSITY EVOLUTION:A CASE STUDY FROM THE DONGHE SANDSTONES IN CENTRAL TARIM[J]. Chinese Journal of Geology, 2004, (2): 214-222.