【摘要】 元坝长兴组海相气田为中国埋藏最深、以台地边缘礁滩相储层为主的大型礁滩岩性气田,沉积特征对其储层的发育具有明显的控制作用。但前期主要以沉积的宏观控制作用及静态研究为主,针对沉积对储层控制作用有待深入研究的客观实际,开展了沉积相划分、展布、迁移、模式及演化等方面的精细研究,对元坝长兴组沉积特征采用地质、测井、地震联合研究,发现元坝长兴组主要发育6类沉积相、11种沉积亚相及10种沉积微相,其中台地边缘生物礁相和台地边缘浅滩相分别控制了生物礁和浅滩两套主要储层的生长发育,两套储层分别分布于III级层序高位体系域礁、滩相带中,同时储层具有早滩晚礁、前礁后滩及向北东向迁移的发育特征,而在其沉积模式及演化规律的控制下,长兴组储层生长发育模式主要可分为两类3种生物礁储层和两类浅滩储层,总体上,生物礁储层较浅滩储层更优质,礁带区相对于浅滩区油气更易高产富集。更多还原

【Abstract】 Changxing Formation in Yuanba is the deepest & largest marine lithologic gas field,which is characteristic of reefshoal facies reservoir in platform margin,and the sedimentary characteristics obviously controls over the reservoir development.Previous studies are mainly about static researches of sedimentary macro-control. Therefore the author carried out a detailed study on the sedimentary facies division,distribution,migration,patterns and evolution through the joint research of geology,logging and seismic,and found out that in the Yuanba Changxing Formation there have developed six kinds of sedimentary facies,eleven sorts of sedimentary subfacies and ten sorts of microfacies,among which the platform margin reef facies and shoal facies control the growth & development of the reef reservoir and shoal reservoir separately. The two sets of reservoirs are mainly distributed in the reef & shoal facies of grade III sequence highstand system tract. Besides,the reservoir bears the features of early beach and late reef in the longitudinal direction,front reef and back beach and the migration to northeast on the lateral distribution. Under the control of sedimentary facies pattern & evolution,the reservoir growth and development patterns can be divided into two kinds & three patterns of reef reservoirs and two kinds of shoal reservoirs. Generally,the reef reservoir quality is better than that of the shoal reservoir and the reef zones is more favorable for enrichment and high production of oil& gas than the shoal zones.更多还原