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The paleo-hydrogeological condition of Dongying depression and its relation with oil and gas have been studied. The Cenozoic (Kz) in this area is divided into three hydrogeological cycles of Eocene (E2), Oligocene (E3) and Neogene (N)-Quaternary (Q) . Each cycle is in turn divided into two hydrogeological stages of deposition and seeping. The first two cycles brought about accumu-lation and burial of a great quantity of organic matter. The last one was the most important period of generation, migration and accumulation...

The paleo-hydrogeological condition of Dongying depression and its relation with oil and gas have been studied. The Cenozoic (Kz) in this area is divided into three hydrogeological cycles of Eocene (E2), Oligocene (E3) and Neogene (N)-Quaternary (Q) . Each cycle is in turn divided into two hydrogeological stages of deposition and seeping. The first two cycles brought about accumu-lation and burial of a great quantity of organic matter. The last one was the most important period of generation, migration and accumulation of oil and gas in this area. It was also the formation period of a large number of oil and gas pools. The general direction of s tratigraphic water in this area was from the center of the depression to the periphery. The seeping of the peri-pheral surface water was secondary. An estimation of the number of water-displacement in deposition and seeping stages show that the activity of depo-sition water far exceeds that of seeping water. This is quite favourable to the migration, accumulation and preservation of oil and gas.

本文探讨了东营凹陷的古水文地质条件反其与油气的关系。文中将本区新生代划分为始新世、渐新世、中上新世—第四纪三个水文地质旋回,各旋回又进一步划分为沉积和渗入两个水文地质阶段。前两个旋回导致了本区有机质的大量堆积和埋藏,后一个旋回则是本区油气生成、运移、聚集的主要时期,亦是油气藏大量形成的时期。本区古地层水的主要流向是由凹陷内部指向边缘,而边缘地表水的渗入是次要的。估算的水交替次数表明沉积水的活动程度远超过渗入水,这对油气的移聚和保存十分有利。

6 hydrogeologic circles after the deposition of the Yangxin Limestone are recognized. According to data of area integration from the compaction curve, among waters entering into the Yangxin Limestone, Silurian squeezed water is predominant. Water from Longtan Formation and Silurian System are 0.4 trillion cubic metres (26.68 percent of the total Longtan squeezed water) and 7.5 trillion cubic metres (68.34 percent of the total Silurian squeezed water) respectively. The latter gives more influence upon the fluids...

6 hydrogeologic circles after the deposition of the Yangxin Limestone are recognized. According to data of area integration from the compaction curve, among waters entering into the Yangxin Limestone, Silurian squeezed water is predominant. Water from Longtan Formation and Silurian System are 0.4 trillion cubic metres (26.68 percent of the total Longtan squeezed water) and 7.5 trillion cubic metres (68.34 percent of the total Silurian squeezed water) respectively. The latter gives more influence upon the fluids in Yangxin Limestone. Squeezed water for each well in different geologic period is calculated quantitatively. On the palaeohydrodynamic maps, it is clearly observed that the occurrence of high-pressure area is inheritable, that explains why the natural gas is accumulated mainly on the ancient Luzhou uplift and in the western part of the researched region.As the squeezed water entered into Yangxin Limestone, the gas produced from coal in Longtan and the natural gas in Silurian might have also moved into the same stratum. In addition, Yangxin Limestone itself is also a productive source bed. Thus the natural gas in Yangxin Limestone is a mixture of gases originated from several strats.

研究区自阳新统沉积后,经历了6个水文地质旋回。按压实曲线用积分求面积的方法计算结果,自志留系进入阳新统的水量最多,对阳新统的影响较大,并已为若干地球化学资料所证实。从古水动力图上看,高压区的分布是继承性的,因而解释了研究区西部和泸州古隆起上天然气富集的原因。阳新统中的天然气是志留系中生成的天然气、龙潭组中的煤成气以及阳新统本身所生天然气的混合物。

From the cyclic points of view, the present paper deals with the relationship between the underground water flow and hydrocarbons in Jiuxi basin.

酒西盆地可分为二大水文地质旋回,即白垩纪水文地质旋回和新生代水文地质旋回.每个旋回分为二个阶段,即沉积压实水流阶段和重力渗入水流阶段.水动力场、水化学场表明盆地南部油气富集带处于新生代水文地质旋回沉积压实水流的停滞泄水区,而北部单斜带处于重力渗入水流阶段.为了定量分析沉积压实水动力状况,本文提出了一种简便方法,即求解地上水均衡方程,可得出不同时期沉积水动力场特征.计算结果表明,白垩系原生油藏位于水动力场特定部位:高水头区中的低水头区、水头陡急变化带即停滞泄水区.

 
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