热欧地区残留可容纳空间分布及储集砂体预测

辽河盆地热欧地区勘探程度低,取心资料少,砂体与油气分布具有较强的隐蔽性。针对这一问题,首次将层序地层学的原理和方法应用于该区储集砂体分布规律的预测。对地层的重新划分与对比发现,研究区沙三段内部存在着明显的不整合界面SB₂。该不整合面的形成期正是河道砂储集体沿层序SQ₂-TST沉积初期残留可容纳空间的充填期,因此循着层序界面SB₂寻找沉积古地貌低洼区是预测砂岩储集体的关键。对比发现,受断裂与火山岩堆集体的联合控制,古地貌低洼区沿沟谷及火山岩体侧翼的断槽一带展布,钻井证实该带是层序SQ₂-TST河道砂体的主要充填区。对这些砂体的成功预测有效地指导了该地区油气勘探。

PREDICTION OF REMAINED ACCOMMODATION DISTRIBUTION AND SANDY RESERVOIR OF RE-OU AREA IN LIAOHE BASIN

Re_Ou area of Liao basin has the features of low exploration degree,lack cored data,and the indecision of sandy hydrocarbon reservoirs.The sequence stratigraphy was applied to predict the distribution of sandy reservoirs.The sequence subdivision and correlation showed the unconformity of S 3 member of the study area,i.e.sequence boundary SB 2 was discovered between the upper formation and the lower formation of S 3 member.The duration of the developing period of SB 2 is the remained accommodation when the channel sand bodies filled along the palaeo_geomorphologic low.Therefore,the palaeo_geomorphologic low along the sequence boundary SB 2 is the target area of the sandy reservoirs.The palaeo_geomorphologic low in Re_Ou area was governed by faults and volcanic rocks and mainly developed along the flank of the volcanic rocks accumulation.The prediction of sandy reservoirs developed along the palaeo_geomorphologic low was effective and verified by drilling.