The 3

rd

member of Funing Formation has a great potential for oil and gas exploration and will be one of the most important targets for reserve growth and production addition of SINOPEC Huadong Oilfield Company.However

the reservoir heterogeneity is strong and hydrocarbon enrichment patterns are poorly understood

seriously constraining future exploration and development.Based on study of the basic geologic conditions for source rocks

reservoirs

and traps

abnormal pressure is analyzed according to the rules of mudstones compaction.The abnormal pressures of Funing Formation are caused by ofundercompaction

instead of hydrocarbon generation of kerogen.The deep high-quality reservoirs are closely related with undercompaction and the high-quality reservoirs occur in areas where the abnormal pressure is high.The high abnormal pressure occurs in interval from the top 3

rd

member to 4

th

member of Funning Formation and forms a regional seal.Hydrocarbons mainly accumulate in low potential areas below this seal.High abnormal pressure favors hydrocarbon accumulation in the 3

rd

member of Funning Formation

while low abnormal pressure may be favorable for hydrocarbon accumulation in the overlying Dainan Formation.Based on study of the regional high abnormal pressure seal and sedimentary microfa-cies

it is believed that the hydrocarbon accumulation conditions of the 3

rd

member of Funning Formation are better to the south

thus the 3

rd

member to the south is a favorable target for future exploration.