富县探区低孔低渗砂体的成因类型与层内非均质模式
- 收稿日期:
1900-01-01
- 修回日期:
1900-01-01
- 刊出日期:
2007-02-10
摘要: 根据露头剖面、钻井、岩芯、分析化验、测井等资料的沉积相精细分析，鄂尔多斯盆地富县探区上三叠统延长组长6段主要发育三角洲、湖泊和湖底扇三种沉积相，在其中识别出的砂体成因类型主要有分流河道、河口坝、远砂坝、重力流水道、远源浊积等10种不同微相类型的砂体，它们的孔隙度分布于2.20%～14.90%,渗透率为0.01×10-3～6.50×10-3μm2，多数属于低孔低渗储层类型。导致这些砂体最终演变成低孔低渗储层的主要原因是沉积期后的压实作用和胶结充填作用，求得压实损孔率为18%～19％，胶结充填损孔率平均约为9％，最终使这些砂体的现今平均孔隙度仅在10％左右。根据单砂体内粒度、孔隙度、渗透率等储层参数及其测井响应特征在垂向上的变化型式，区分出孔渗向上变差型、孔渗向上变好型、复合型、复杂型等四种基本类型的层内非均质模式，分析并指出了前三种层内非均质性主要受控于砂体微相类型、沉积水动力、沉积物粒度、沉积序列等因素，而复杂型层内非均质性则主要与砂体内差异胶结作用、差异埋藏溶蚀作用等成岩改造因素有关。
Genetic Type and Intrafomational Heterogeneity Pattern of Lowporosity and Lowpermeability Sandbodies in Fuxian Exploration Area
- Southwest Petroleum University, Chengdu 610500
- Received Date:
1900-01-01
- Rev Recd Date:
1900-01-01
- Publish Date:
2007-02-10
Abstract: On the basis of a careful analysis of sedimentary facies from outcrop sections, cores, test data, drilling and well loggings, delta, lake, and sublacustrine fan facies are mainly developed in the Chang 6 Member, Yangchang Formation, Upper Triassic in Fuxian Exploration Area of Ordos Basin. Ten microfacies types of sandbody have been distinguished in these sedimentary facies, for example distributary channel, rivermouth bar, distal bar, gravityflow channel, and distal turbidite sandbodies. Their reservoirs range from 2.20% to 14.90% in the porosity and vary from 0.01×10-3μm2 to 6.50×10-3μm2 in the permeability. These sandbodies are mostly the reservoir type of low porosity and permeability. They are resulted from postdepositional compaction, cementation and filling. The loss ratio of porosity from the compaction is 18%～19％, and those from cementation and filling is equally about 9%. An average of ultimate porosity is equally about 10% today. Four basic types of intraformational heterogeneity are recognized by the vertical pattern of grain size, porosity, permeability and other reservoir parameters and logging response. These types of intraformational heterogeneity are porosity and permeability pooring upward, porosity and permeability improving upward, compound, and complex types. The former three types of intraformational heterogeneity are determined by sandbody microfacies, depositional hydrodynamics, sediment grainsize, depositional sequence. The complex type of intrafomational heterogeneity is largely related to the diagenetic reworking, including differential cementation and differential buried dissolution.
陈景山. 富县探区低孔低渗砂体的成因类型与层内非均质模式[J]. 沉积学报, 2007, 25(1): 53-58.
| 引用本文: |
陈景山. 富县探区低孔低渗砂体的成因类型与层内非均质模式[J]. 沉积学报, 2007, 25(1): 53-58.
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CHEN Jingshan. Genetic Type and Intrafomational Heterogeneity Pattern of Lowporosity and Lowpermeability Sandbodies in Fuxian Exploration Area[J]. Acta Sedimentologica Sinica, 2007, 25(1): 53-58.
| Citation: |
CHEN Jingshan. Genetic Type and Intrafomational Heterogeneity Pattern of Lowporosity and Lowpermeability Sandbodies in Fuxian Exploration Area[J]. Acta Sedimentologica Sinica, 2007, 25(1): 53-58.
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