Study on the Distribution of Hydrocarbon and Controlling Factors of the Deep Burial Strata in Anpeng Oilfield of Biyang Sag

Key words: 
• Anpeng oilfield /
• updip wedge-out pool /
• the process of pool forming /
• oil-gas distribution /
• controlling factors

Abstract: With the increasing demand of oil and gas resource, oil and gas exp loration have to expand to the deep zone. To reinforce the cognition of oil-gas distribution laws and its controlling factors is the key to achieve further in the deep zone. This article is based on the exp loration achievements and geological cognition over the past years in the deep zone in Biyang sag, Anpeng oil field, and the laws of oil and gas distribution and the main controlling factors are analyzed in details. It shows that oil and gas distribution is inhomogeneous vertically. It has been found that the deep layer pool of Anpeng oil field mainly was updip wedge out trap. In Formation Hetaoyuan Ⅲ member Ⅴsand layer is the most enriched with oil and gas, Ⅵ is less, Ⅶ and Ⅷ is the lest. In the plane, oil and gas gathersmainly along the axial lobe of nose structure near Well Bi185-Well Bi252 region. Sedimentary facies, diagenesis and structure are the main controlling factors to influence the distribution of oil and gas in this region. The site that is located on the eminence of nose structure, and far-source the underwater distributary channel and estuary bar experiencing the late dagenetic period B is the most promising for accumulation of oil and gas. Vertically, late diagenetic period B sand layer is advantageous for oil and gas gathering, while late diagenetic subperiod A₃ sand layer is disadvantageous for oil and gas gathering