松辽盆地北部异常高压在油气成藏与保存中的作用

Role of abnormal high pressure in the formation and preservation of oil(gas) reservoirs in the north of Songliao Basin.

通过松辽盆地北部青山口组和嫩一段、嫩二段泥岩异常高压及其在油气运聚成藏与保存中的作用研究 ,认为异常高压不仅是其烃源岩油气向外排出的动力 ,还是油气穿层运移和倒贯运移的动力。异常高压极值点的位置控制了油气在纵向上的分配量。异常高压增强了该区泥岩盖层毛细管封闭能力 ,使其具有抑制浓度封闭作用 ;使T2 、T1 断层具封闭性 ,阻止地下水及氧和细菌对油气藏的破坏。异常高压导致了青山口组泥岩内构造裂缝开启 ,有利于形成泥岩裂缝油气藏。

By studying the abnormal high pressure of Qingshankou formation, Nen 1 and Nen 2 mudstone and their roles in formation and preservation of oil (gas) reservoirs in the north of Songliao Basin, it is considered that abnormal high pressure is not only the power of expelling oilgas from their source rocks, but also the power of oilgas throughlayered and reverse migration. The location of extreme point of abnormal high pressure controls the longitudinal oilgas distribution amount. Mudstones caprock in this area has the capability of restraining concentration sealing since its stronger capillary enclosed ability, T 1 and T 2 fault have the enclosed capacity with the result that inhibiting underground water, oxygen and bacteria from destruction in oilgas reservoirs under the abnormal high pressure. Abnormal high pressure made the structural fractures in mudstones of Qingshankou formation open, it is in favor of forming mudstone fracture oilgas reservoirs.