CAJ | 학술논문

渤海湾盆地临清坳陷东濮凹陷中央隆起带北部发现三叠系裂缝性砂岩油气藏,油气主要富集在岩石节理、裂缝、缝洞中,基质不含油.通过对油气族组成、稳定碳同位素组成及生物标志化合物进行油气地球化学研究,认为东濮凹陷三叠系砂岩裂缝性油藏原油来源于古近系,油藏类型为新生古储式;天然气来源于石炭-二叠系,气藏类型为古生新储式.在油气地球化学研究的基础上,分析东濮凹陷三叠系砂岩裂缝性油藏成藏条件,认为供烃条件、储集空间、构造部位是油气成藏的主控因素.供烃条件决定油气藏规模、裂缝提供油气储集空间、构造控制油气成藏位置.根据东濮凹陷中央隆起带北部不同地区三叠系储集层构造特征、供烃条件、油气藏特征,总结出东濮凹陷北部三叠系砂岩裂缝性油气藏的3种成藏模式,即:双断双向供烃成藏、单断双向供烃成藏、单断单向供烃成藏.
발해만분지림청요함동복요함중앙륭기대북부발현삼첩계렬봉성사암유기장,유기주요부집재암석절리、렬봉、봉동중,기질불함유.통과대유기족조성、은정탄동위소조성급생물표지화합물진행유기지구화학연구,인위동복요함삼첩계사암렬봉성유장원유래원우고근계,유장류형위신생고저식;천연기래원우석탄-이첩계,기장류형위고생신저식.재유기지구화학연구적기출상,분석동복요함삼첩계사암렬봉성유장성장조건,인위공경조건、저집공간、구조부위시유기성장적주공인소.공경조건결정유기장규모、렬봉제공유기저집공간、구조공제유기성장위치.근거동복요함중앙륭기대북부불동지구삼첩계저집층구조특정、공경조건、유기장특정,총결출동복요함북부삼첩계사암렬봉성유기장적3충성장모식,즉:쌍단쌍향공경성장、단단쌍향공경성장、단단단향공경성장.
Triassic fractured sandstone reservoirs have been found in the north of Central Uplift in Dongpu Sag, Linqing Depression, Bohai Bay Basin. Hydrocarbons accumulate in joints, fractures, and cavities. There is no oil in the matrix. The analysis of group component, stable carbon isotopic compositions and biomarker, and the geochemical characteristics of the oil and gas show that the oil comes from the Palaeogene and the oil reservoir is new bed-generating and old bed-storing;the gas comes from Carboniferous-Permian and the gas reservoir is old bed-generating and new bed-storing. Based on the geochemical characteristics of the oil and gas, the forming conditions were analyzed. The main controlling factors of reservoir formation are source rock, storage space, and structural location. The condition of hydrocarbon generation controls the reservoir scale, the fracture controls space, and the structure controls the oil/gas reservoir location. Based on the Triassic reservoir characteristics of structure, condition of hydrocarbon generation and oil/gas reservoir, the reservoir models were summarized, i.e. two-fault and two-way hydrocarbon supply model, one-fault and two-way hydrocarbon supply model, one-fault and one-way hydrocarbon supply model.