The Member 4 of Sinian Dengying Formation gas reservoir in Gaoshiti block of Sichuan Basin is mainly controlled by the deposition of mound-shoal complex and epigenic karstification. Due to the cause of multi-factor superposition, there are some limitations in reservoir characterization of Member 4 of Dengying Formation according to the existing reservoir classification and evaluation criterion. Based on core observations, conventional and imaging log data analyses, CT core scanning and thin section identification, the karst reservoirs of Member 4 of Dengying Formation in Gaoshiti block can be divided into pore type, pore-vuggy type and fracture-vuggy type with matching reservoir spaces. Among them, the pore-vuggy and pore-vuggy reservoirs have the characteristics of good physical properties, easy exploitation and good pilot production, and are the high-quality reservoir type in Member 4 of Dengying Formation. In addition, on the basis of fine reservoir classification in single wells, application of conventional seismic reservoir prediction and ant tracking technology, as well as analyses of the dynamic data such as well test curves, production curves and open flow capacities of typical wells, the division scheme of gas well productivity can be established and the productivity models can be classified into three categories (Ⅰ, Ⅱ and Ⅲ) for Member 4 of Dengying Formation in Gaoshiti block. The high- quality reservoir has a high proportion in the productivity model Ⅰ and model Ⅱ, showing broad trough-shaped seismic reflection in the upper submember of Member 4 of Dengying Formation, well developed fracture-vuggy bodies in ant tracking attributes, and good effects during pilot production.
REN Hongjia,GUO Qiulin,ZHOU Gang,et al.Analysis of gas resource potential of Sinian and Cambrian in the eastern Sichuan Basin[J].China Petroleum Exploration,2018,23(4):21-29.
WANG Zecheng,ZHAO Wenzhi,HU Suyun,et al.Control of tectonic differentiation on the formation of large oil and gas fields in craton basins:a case study of Sinian-Triassic of the Sichuan Basin[J].Natural Gas Industry,2017,37(1):9-23.
WEI Guoqi,LI Jun,SHE Yuanqi,et al.Distribution laws of large gas fields and further exploration orientation and targets in China[J].Natural Gas Industry,2018,38(4):12-25.
JIN Mindong,TAN Xiucheng,TONG Mingsheng,et al.Karst paleogeomorphology of the fourth Member of Sinian Dengying Formation in Gaoshiti-Moxi area,Sichuan Basin,SW China:restoration and geological significance[J].Petroleum Exploration and Development,2017,44(1):58-68.
State Economic and Trade Commission.The description of exploitation geologic characteristics for carbonate gas reservoir:SY/T 6110-2002[S].Beijng:Petroleum Industry Press,2002.
XIAO Fusen,CHEN Kang,RAN Qi,et al.New understandings of the seismic modes of high productivity wells in the Sinian Dengying Fm gas reservoirs in the Gaoshiti area,Sichuan Basin[J].Natural Gas Industry,2018,38(2):8-15.
YANG Wei,WEI Guoqi,ZHAO Rongrong,et al.Characteristics and distribution of karst reservoirs in the Sinian Dengying Fm,Sichuan Basin[J].Natural Gas Industry,2014,34(3):55-60.
ZHANG Lin,WAN Yujin,YANG Hongzhi,et al.The type and combination pattern of karst vuggy reservoir in the fourth member of the Dengying Formation of Gaoshiti structure in Sichuan Basin[J].Natural Gas Geoscience,2017,28(8):1191-1198.
DAI Xiaofeng,LIU Weidong,GAN Lideng,et al.The application of Radon transform to suppress interbed multiples in Gaoshiti-Moxi region[J].Acta Petrolei Sinica,2018,39(9):1028-1036.
JIANG Yuqiang,TAO Yanzhong,GU Yifan,et al.Hydrothermal dolomitization in Sinian Dengying Formation, Gaoshiti-Moxi area,Sichuan Basin,SW China[J].Petroleum Exploration and Development,2016,43(1):51-60.
[12]
GU Yifan,ZHOU Lu,JIANG Yuqiang,et al.A model of hydrothermal dolomite reservoir facies in Precambrian dolomite,Central Sichuan Basin,SW China and its geochemical characteristics[J].Acta Geologica Sinica (English Edition),2019,93(1):130-145.
ZHU Xun,GU Yifan,JIANG Yuqiang,et al.Characteristics and reservoir body classification & evaluation of Sinian Dengying karst reservoirs in the Gaoshiti Block of central Sichuan Basin[J].Natural Gas Industry,2019,39(3):38-46
LIU Hong,LUO Sicong,TAN Xiucheng,et al.Restoration of paleokarst geomorphology of Sinian Dengying Formation in Sichuan Basin and its significance,SW China[J].Petroleum Exploration and Development,2015,42(3):283-293.
YANG Yu,HUANG Xianping,ZHANG Jian,et al.Features and geologic significances of the top Sinian karst landform before the Cambrian deposition in the Sichuan Basin[J].Natural Gas Industry,2014,34(3):38-43.
WEN Long,WANG Wenzhi,ZHANG Jian,et al.Classification of Sinian Dengying Formation and sedimentary evolution mechanism of Gaoshiti-Moxi area in central Sichuan Basin[J].Acta Petrologica Sinica,2017,33(4):1285-1294.
CHEN Yana,SHEN Anjiang,PAN Liyin,et al.Features,origin and distribution of microbial dolomite reservoirs:a case study of 4th Member of Sinian Dengying Formation in Sichuan Basin,SW China[J].Petroleum Exploration and Development,2017,44(5):704-715.
YANG Yueming,YANG Yu,YANG Guang,et al.Gas accumulation conditions and key exploration & development technologies of Sinian and Cambrian gas reservoirs in Anyue gas field[J].Acta Petrolei Sinica,2019,40(4):493-508.
WEI Guoqi,YANG Wei,XIE Wuren,et al.Accumulation modes and exploration domains of Sinian-Cambrian natural gas in Sichuan Basin[J].Acta Petrolei Sinica,2018,39(12):1317-1327.
LAN Caijun,XU Zhehang,MA Xiaolin,et al.Development and distribution of mound-shoal complex in the Sinian Dengying Formation,Sichuan Basin and its control on reservoirs[J].Acta Petrolei Sinica,2019,40(9):1069-1084.