Prediction of reef and bank reservoir of the Permian Changxing Formation in Jiannan area， Sichuan Basin
Qin Jun1, Chen Yuming1, Liu Wenhui2
1 Institute of Petroleum Exploration and Development，SINOPEC Jianghan Oilfield Company，Qianjiang 433124，Hubei 2 Logging Company of SINOPEC Huabei Petroleum Administration Bureau，Zhengzhou 450007，Henan
Abstract：The distribution of reef and bank reservoir of the Changxing Formation in Jiannan area is controlled by the distribution of the Kaijiang-Liangping Basin. The response characteristics on seismic profile of the reef and bank were studied. Mainly on the basis of drilling well data and forward simulation model, the research results indicate that the thickness of limestone of the Member 4 of Maokou Formation is related with the shape of TP2 seismic reflection interval. During the late period of Maokou Formation, the Dongwu tectonic movement occurred in the study area which led to the intensive stratigraphic exposion. The remnant thickness of limestone of the top Member 4 of Maokou Formation was thin and led to the “two intensive” reflection on seismic profile. In contrast, less exposion occurred at lower paleotopographic unit. Thus the remnant thickness of limestone of the Member 4 of Maokou Formation was thick and the corresponding seismic reflection is characterized by “three intensive” reflection. The relationship between paleotopography and seismic attributes was established using this characteristic. The analyses show that the tectonic framework is characterized by “lower in west and higher in east” in the late depositional period of the Maokou Formation.Due to the influence of tectonic movement in the early period of Changxing Formation, the Kaijiang-Liangping Basin gradually expanded and formed a new paleotopography in the late depositional period of submember 2 of Changxing Formation. By the analyses of stratigraphic slice data, outcrop and drilling well data, the authors propose that the basin crossed the study area. A new viewpoint about the distribution of the basin has been proposed and the profitable developing area of reef and bank has been identified combining with tectonic movement and current data and the comprehensive geophysical and geological data.
Qin Jun,Chen Yuming,Liu Wenhui. Prediction of reef and bank reservoir of the Permian Changxing Formation in Jiannan area， Sichuan Basin[J]. JOPC, 2011, 13(4): 426-433.
