Investigation of Palynofacies Potential and Sedimentary Environment on One of the Fields in Southwest Iran

Abstract

The purpose of this study is to investigate palynofacies potential and sedimentary environment in one of the fields in Southwest Iran. After palynological slides were prepared, the palynological elements of samples were detected among 200-400 grains for each sample under the microscope with a magnification of 16. The groups of palynological elements (amorphous organic matter (AOM), marine palynomorph, phytoclasts, spore, and pollen) were calculated using their sample percentages. The results showed that samples studied in wells 50 and 70 are classified into palynofacies groups VI and IX regarding the organic matters and palynological elements existing in them, while samples in wells 62 and 26 are placed in the palynofacies groups VI and II. Regarding the Tyson Diagram, the palynofacies VI contains abundant AOM and average phytoclast content, representing an offshore environment and a recovery existing in an oil window with high hydrocarbon generation power, and IX has abundant AOM with very low rate of palynomorph, representing a semi-oxygenated to low-oxygen and offshore environment and in an oil window with very high production power. The palynofacies II contains high phytoclast and low AOM, indicating a basin margin environment with recovery conditions in the gas generation window with minor oil. In palynofacies IX group, a high amount of clear and bright amorphous organic matter (80-100) exists. The amount of amorphous organic matter in palynofacies VI is decreased (40-70%) rather than IX, while phytoclast usually varies between 10% and 30%. There is a considerable decline in the amount of AOM in the palynofacies group reaching around 15-35%..