上生下储倒灌式油气运聚成藏空间预测方法及其应用  

Predicting method of migration and accumulation space of the hydrocarbon reversed in upper source⁃lower reservoir combination and its application

作　　者：于洋[1] YU Yang(No.4 Oil Production Plant of Daqing Oilfield Co.Ltd,Daqing 163514,China)

机构地区：[1]大庆油田有限责任公司第四采油厂,黑龙江大庆163514

出　　处：《大庆石油地质与开发》2021年第6期44-51,共8页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家自然科学基金项目“砂泥岩层系中油源断裂输导油气优势路径演化及识别研究”(41872157);国家自然科学基金项目“断砂配置侧向分流运聚油气机理及有利部位识别研究”(42072157)。

摘　　要：为了研究含油气盆地上生下储倒灌式油气运聚成藏规律,在上生下储倒灌式油气运聚成藏机制及其空间分布研究的基础上,通过确定源岩排烃分布区、倒灌式油气运移源岩超压分布区和输导断裂分布区,确定上生下储倒灌式油气运聚成藏平面分布区;通过确定上生下储倒灌式油气运聚最大深度分布和输导断裂延伸长度分布,确定上生下储倒灌式油气运聚成藏纵向分布区,将二者组合,建立了一套上生下储倒灌式油气运聚成藏空间的预测方法,并将其应用于松辽盆地北部三肇凹陷青一段源岩向下伏扶杨油层倒灌式油气运聚成藏空间的预测中。结果表明:三肇凹陷青一段源岩向下伏扶杨油层倒灌式油气运聚成藏空间分布广泛,平面上除了东北边部和东南边部局部地区外,整个凹陷大部分地区皆为青一段源岩向下伏扶杨油层倒灌式油气运聚成藏平面分布区;纵向上倒灌式油气运聚最大深度可达500 m以上,主要分布在其北部和中部地区,由此向其四周逐渐减小,在凹陷东南边部和西南局部地区减小至100 m以下。青一段源岩向下伏扶杨油层倒灌式油气运聚成藏空间有利于上覆青一段源岩生成油气在超压作用下通过输导断裂向下伏扶杨油层运移和聚集,与三肇凹陷扶杨油层已发现油气分布相吻合,表明该方法用于预测上生下储倒灌式油气运聚成藏空间是可行的。In order to study the law of hydrocarbon reversed migration and accumulation in combination of upper source rocks and lower reservoirs in the petroliferous basin,based on its mechanism and spatial distribution,the planar distribution area of hydrocarbon reversed migration and accumulation in upper source⁃lower reservoir combi⁃nation was determined by determining the source⁃rock hydrocarbon expulsion distribution area,source⁃rock over⁃pressure distribution area of hydrocarbon reversed migration and the transporting fault distribution area;its vertical distribution area was also determined by determining the maximal depth distribution and the transporting fault exten⁃sion length distribution.With the combination of the above two,a set of predicting methods of oil⁃gas migration and accumulation space was established and used to predict the hydrocarbon reversed migration and accumulation space from K_(1)qn_(1)source rock to the underlying Fuyang oil layer in Sanzhao Sag of North Songliao Basin.The results show that the oil⁃gas migration and accumulation space in source rock and oil layer of the sag is widely distributed.Areal⁃ly,except for some areas in the northeast and southeast margins,most of the sag are the planar distribution area of the hydrocarbon reversed migration and accumulation from K_(1)qn_(1)source rock to the underlying Fuyang oil layer.Vertically,the maximal depth of hydrocarbon reversed migration and accumulation can reach more than 500 m,which is mainly distributed in the northern and central areas,and gradually decreases to the surrounding area and even below 100 m in the parts of southeast and southwest of Sanzhao Sag.The hydrocarbon reversed migration and accumulation space from K_(1)qn_(1)source rock to the underlying Fuyang oil layer is beneficial for the migration and ac⁃cumulation of oil and gas generated from the overlying K_(1)qn_(1)source rock to the lower Fuyang oil layer via the trans⁃porting fault under the action of overpressure,which is consistent with the distr

关 键 词：上生下储 倒灌式 油气运聚 成藏空间 预测方法 

分 类 号：TE122.1􀆰[石油与天然气工程—油气勘探]