Daanzhai limestone in the Szechuan Basin consists of biosparite, biomicrite and micrite, with intercalations of black shales. Daanthai limestone is of lake origin and known as oil reservoir rocks. There are five layer...Daanzhai limestone in the Szechuan Basin consists of biosparite, biomicrite and micrite, with intercalations of black shales. Daanthai limestone is of lake origin and known as oil reservoir rocks. There are five layers of reservoir rocks, of which D-3 is the most important in Shuangsijiao oil field. Stained thin sections were studied for 250 limestone samples from the oil field. In addition to non-ferrous calcite, three phases of ferrous calcite were identified in Daanzhai limestone, which are ferrous calcite Ⅰ (0.5 to 1.5% FeO), ferrous calcite Ⅱ (1.5 to 2.5% FeO) and ferrous calcite Ⅲ (2.5 to 3.5% FeO). Shuangsijiao off field belongs to diagenetic trap type. It has been confirmed that the non.ferrous sparry calcite cementation and solution (vug) of the second period control the distribution of commercial oil wells, which are located in southeastern part of the structure trap.展开更多
针对塔里木盆地塔北哈拉哈塘油田碳酸盐岩缝洞型成岩圈闭,综合利用区域地质、钻录井、酸化压裂、压力测试、生产动态等动静态资料,探讨圈闭的动态识别方法、特征及成因。研究认为,由于碳酸盐岩缝洞型储层渗透率高,一定条件下可以利用井...针对塔里木盆地塔北哈拉哈塘油田碳酸盐岩缝洞型成岩圈闭,综合利用区域地质、钻录井、酸化压裂、压力测试、生产动态等动静态资料,探讨圈闭的动态识别方法、特征及成因。研究认为,由于碳酸盐岩缝洞型储层渗透率高,一定条件下可以利用井口油压数据绘制 Np-△ p 图,并以此判断油藏属于开放性油藏还是封闭性成岩圈闭油藏;研究区缝洞型成岩圈闭规模总体较小,储层类型以洞穴型为主,圈闭盖层岩性、储盖组合及遮挡条件多样,发育多种圈闭要素组合模式;多期充填叠加是研究区缝洞型成岩圈闭封闭的根本原因,新近纪以来大规模快速沉降引发的成岩充填可能是大多数缝洞型成岩圈闭封闭的直接原因,沉降同时导致部分油藏形成异常高压。展开更多
文摘Daanzhai limestone in the Szechuan Basin consists of biosparite, biomicrite and micrite, with intercalations of black shales. Daanthai limestone is of lake origin and known as oil reservoir rocks. There are five layers of reservoir rocks, of which D-3 is the most important in Shuangsijiao oil field. Stained thin sections were studied for 250 limestone samples from the oil field. In addition to non-ferrous calcite, three phases of ferrous calcite were identified in Daanzhai limestone, which are ferrous calcite Ⅰ (0.5 to 1.5% FeO), ferrous calcite Ⅱ (1.5 to 2.5% FeO) and ferrous calcite Ⅲ (2.5 to 3.5% FeO). Shuangsijiao off field belongs to diagenetic trap type. It has been confirmed that the non.ferrous sparry calcite cementation and solution (vug) of the second period control the distribution of commercial oil wells, which are located in southeastern part of the structure trap.
文摘针对塔里木盆地塔北哈拉哈塘油田碳酸盐岩缝洞型成岩圈闭,综合利用区域地质、钻录井、酸化压裂、压力测试、生产动态等动静态资料,探讨圈闭的动态识别方法、特征及成因。研究认为,由于碳酸盐岩缝洞型储层渗透率高,一定条件下可以利用井口油压数据绘制 Np-△ p 图,并以此判断油藏属于开放性油藏还是封闭性成岩圈闭油藏;研究区缝洞型成岩圈闭规模总体较小,储层类型以洞穴型为主,圈闭盖层岩性、储盖组合及遮挡条件多样,发育多种圈闭要素组合模式;多期充填叠加是研究区缝洞型成岩圈闭封闭的根本原因,新近纪以来大规模快速沉降引发的成岩充填可能是大多数缝洞型成岩圈闭封闭的直接原因,沉降同时导致部分油藏形成异常高压。
