Title: Sedimentary facies division of Yijianfang Formation in the middle Ordovician of the southern Tahe Oilfield
Abstract: The signs for recognizing and dividing the key sequence interface in Yijianfang Formation were analyzed by using geology,log and seismic methods.The boundary between Yijianfang Formation and Qiaerbakezu Formation was newly conformed according to the sequence stratigraphy.The high-revolution sequence stratigraphy framework for fifth-order sequence in the upper Yijianfang Formation(the upper high system tract)was founded within the three-order sequence.The three-order sedimentary facies were resumed using well drilling and seismic data.The beach body distribution in Ⅱ-Ⅴ high frequency sequence in the upper Yijianfang Formation was finely depicted,and the beach body evolvement law in each high frequency sequence was analyzed.It shows that one platform was divided into two platforms from early Ordovician to the middle Ordovician in Tarim Basin.Two sedimentary facies including open platform,intraplatform reef and beach body facies were developed in Yijianfang Formation,and the reefs and beach body characterized by point reefs and beach body within the carbonate platform were distributed in the break of slope of the platform.
Publication Year: 2008
Publication Date: 2008-01-01
Language: en
Type: article
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Cited By Count: 1
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