川中中台山地区致密砂岩储层层序特征及有利区优选  

Sequence Characteristics of Dense Sandstone Reservoirs and FavorableZone Preference in Zhongtaishan Area, Central Sichuan

作　　者：郑超[1] 邱玉超 文龙[1] 李楠[1] 吴长江[1] 张晓丽 陈双玲 袁纯 Zheng Chao;Qiu Yuchao;Wen Long;Li Nan;Wu Changjiang;Zhang Xiaoli;Chen Shuangling;Yuan Chun(PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610000,China)

机构地区：[1]中国石油西南油气田分公司,四川成都610000

出　　处：《特种油气藏》2024年第2期84-92,共9页Special Oil & Gas Reservoirs

基　　金：中国石油西南油气田分公司科技专项“四川盆地中西部地区致密气勘探开发理论及关键技术研究”课题1“四川盆地中西部地区致密气成藏条件及物探关键技术研究”(2022ZD01-01)。

摘　　要：川中中台山地区须三下亚段(须三下)层序构成差异性明显、河流相砂体横向变化较快,层序地层划分较为困难,进而影响优质储层的识别与刻画。为此,基于测井、录井和地震资料,分析中台山地区须三下层序特征,圈定不同朵页体的分布范围,对储层有利区进行优选。结果表明:川中中台山地区须三下地层沉积继承了须二上亚段的地层特征,为东南高西北低、洼中隆的缓坡古构造背景,共识别出3期层序界面和2期湖泛面;致密砂岩储层矿物组分主要为岩屑和长石,孔隙类型以溶蚀孔隙、微裂缝为主;岩性组合主要有厚层砂岩组合、厚层砂夹薄层泥岩组合和厚层泥夹薄层砂岩组合三大类;结合高产井具有断裂、裂缝、储层发育,位于构造相对高部位的特征,将研究区储层划分为3类有利区。研究成果可为后续的勘探开发提供重要参考和理论支撑。In the lower sub-member of the third member of Xujiahe Formation in the Zhongtaishan Area of central Sichuan is characterized by obvious differences in stratigraphic composition and rapid lateral changes of fluvial-phase sands,which makes the delineation of sequence stratigraphy difficult,and thus affects the identification and characterization of high-quality reservoirs.For this reason,the sequence characteristics of the lower sub-member of the third member of Xujiahe Formation in the Zhongtaishan Area were analyzed based on the logging,mud logging and seismic data,and the distribution range of different lobes was circled in order to make a preferential selection of favorable zones for reservoirs.The results show that:for the stratigraphic deposition of the lower sub-member of the third member of Xujiahe Formation in the Zhongtaishan Area of Central Sichuan,the stratigraphic features of the upper sub-member of the second member of Xujiahe Formation are inherited,which is a gently sloping paleotectonic background with high terrain in the southeast,low terrain in the northwest and elevated in the middle of the depression,and three phases of sequence boundary and two phases of flooding surfaces have been identified;the mineral components of the dense sandstone reservoir are mainly rock chips and feldspar,and the pore types are dominated by dissolution pores and microfractures;there are three main types of lithologic assemblages:thick sandstone assemblages,thick sand interbedded with thin mudstone assemblages,and thick mud interbedded with thin sandstone assemblages;combined with the fact that the high-yield wells have the characteristics of fracture,crack and reservoir development,and are located in the relatively high tectonic parts,the reservoirs in the study area are divided into 3 types of favorable zones.The research results can provide important reference and theoretical support for the subsequent exploration and development.

关 键 词：致密砂岩 层序特征 储层预测 须三下 中台山地区 

分 类 号：TE122[石油与天然气工程—油气勘探]