Information regarding the offshore field will be discussed next. Because of the many rivers flowing into the Gulf of Thailand. Such as the Choc Pha Ya River, Thar Chin, Mae Klong, Bang Pa Kong and Tar Pee River, The Gulf is an accumulation of sediments and mineral. The accumulation of organic material is the main source of petroleum. Because petroleum Caused by the deposition and metamorphism of fossil organisms, both plants and animals were being swept down to sediment or sink into the sea. I was swamped with a layer of gravel, sand and mud alternating layers. The weight of the floor stones. With geothermal heat, causing the breakdown of organic matter naturally. Make them become a fossil crude oil and natural gas.