Качество коллекторов продуктивной толщи нижнего плиоцена в бассейнах Южного Каспия и Куры напрямую контролируется кальцитовой цементацией и уплотнением, связанными с седиментационными ycловиями. Изучение взаимодействия этих процессов в коллекторах даёт возможность проанализировать закономерности диагенеза в флювиально-дельтовых песчаниках, особенно с учётом малоизученного влияния карбонатной цементации в флювиально-дельтовых фациях. Выпадение кальцитового цемента при уплотнении осадочных пород существенно влияет на проницаемость песчаных коллекторов и фильтрацию флюидов при добыче нефти и газа. С этой точки зрения изучены особенности распределения конкреций кальцитового цемента в песчаниках верхней продуктивной толщи Южно-Каспийского и Куринского бассейнов и их влияние на пористость, проницаемость и фильтрацию флюидов. Распределение кальцитовых конкреций было картировано в выходах песчаников верхней части продуктивной толщи Ясамальской (Шубанинской) антиклинали на западном фланге Южно-Каспийской впадины. Крупные пластинчатые кальцитовые конкреции в этих флювиально-дельтовых песчаниках, как правило, следуют наклону слоистости в сторону бассейна. По данным рентгеновской дифракции (XRD) и сканирующей электронной микроскопии (SEM) высокое содержание кальцитовых цементных конкреций, присутствующих в песчаниках верхней части продуктивной толщи (балаханский VIII и балаханский VI горизонты) Ясамальской (Шубанинской) антиклинали, значительно снижает пористость и проницаемость для потока флюида. Понимание условий осадконакопления кальцитовой цементации, наблюдаемых в песчаниках продуктивной толщи на западном борту Южно-Каспийского бассейна, имеет важное значение для оценки качества аналоговых коллекторов в песчаниках соседнего Куринского бассейна. Наличие большого объёма кальцитового цемента существенно влияет на петрофизические свойства коллекторов, что обуславливает важность изучения их происхождения.

Ключевые слова: кальцитовый цемент, Южно-Каспийский бассейн, Куринский бассейн, диагенез, поток жидкости, продуктивная толща

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