Human commuting ships is one of the

activities in the coastal areas, such as oil exploration, have caused these
areas to be affected by pollution of hydrocarbons and damage to their ecosystem(Camino-Sánchez et al. 2011) Also, contamination of these areas can affect
human health through the use of seafood (Mele et al. 2018).  Distribution of
aliphatic hydrocarbons has long been used by researchers as geochemical markers(Harvey & Taylor 2017)(Rushdi et al. 2017)(Maciel et al. 2016) Using aliphatic
hydrocarbons, researchers have found indices to determine the type of source of
hydrocarbons. The ratio of LMW1 to
HMW2 is
one of the common index to introduce the hydrocarbons source(Silva & Madureira 2012; Lima et al. 2012). CPI3(Maioli et al. 2011)  and Pri4/Phy5(Ref) are the other indices
that  researchers have been widely used to find out the origin of hydrocarbons.The increase and continuation of human activities in the
gulf has contaminated the sediments of these areas with hydrocarbons (Commendatore et al. 2012).  Industrial and human activities, including car traffic,
have a direct impact on concentration n-alkanes (Vaezzadeh et al. 2015).
In areas close to the entrance to the ports of
loading and commuting ships is one of the factors that increases the concentration
of aliphatic hydrocarbons (Wang et al. 2006). Using aliphatic hydrocarbons indicators, it was found  that 80-90% of the hydrocarbons present in the
region are due to human activity (Rushdi et al. 2017). terrestrial plants, marine plankton or aquatic plants are also the
main causes of the presence of hydrocarbons in sediment (Shuanglin Li , Shengyin Zhang , Heping Dong ,
QingfangZhao 2015). n-alkanes
derived from plant waxes in the region showed an average of 35.6% (Xuelu Gaoa 2008) The ratio of LMW/HMW and CPI showed that the source of hydrocarbons
is not influenced by human activities (Maciel et al. 2016)(Barbosa et al. 2016).