| Author's Name: Qiao Lin, Shen Zhaoguo, Fang Shaoxian, Hou Fanghao,Fu Suotang, Xu Liming, Ma Zhenfang, Yan Ronghui |
| Institution: Southwest Petroleum University |
| Abstract: |
| in the buried Jingbian Buried Platform and its periphery area of Ordos Basin, the sedimentary environment of Middle Ordovician Majiagou 51-4 Sub-member reservoir is generally the inner shelf basin-marginal flat facies. The Majiagou 51-4 reservoir consists of silt-sized crystalline dolostone. Difference of lithology is the basic factor that controls heterogeneity of the reservoir. Silt-sized crystalline dolostone with anhydrite-nodules and/or columnar crystallines plays a predominant role in controlling heterogeneity in this area. Other controlling factors are geologic background, palaeokarst diagenesis, tectonic fissures, fault distribution，etc. In addition, palaeogeo-morphology, effective thickness of reservoir and development of non-reservior are also effective. The main gasproducing zone is in Jingbian Platform but the reservoir did not well-developed or along the west part of the plat-form where strata are severely eroded and the east part rock is heavily dissolved. |
| Keywords: Middle Ordovician; Majiagou Formation; Carbonate reservoir; Reservoir property; Controlled factors;Palaeokarst; Diagenesis; Jingbian Platform; Ordos basin |
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投稿时间：
2006-08-07 |
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