Abstract
Abstract The Cretaceous nonmarine sedimentary strata are widespread in Songliao Basin, Northeast China. As the largest oil producer in China, an abundance of data has been generated by the petroleum industry, including sedimentology, seismology, geochemistry, and geochronology in the Songliao Basin. This article reviews the achievements in China Cretaceous Continental Scientific Drilling SK and presents the new results of the China Continental Geothermal Drilling SR1 in stratigraphy and geophysics. The results allow us to establish the relationships among SK-1, SK-2, and SR1, provide some constrains on the tectonic setting of Songliao Basin, and interpret the sedimentary facies and environmental evolution. After stratigraphic correlation of SK and SR boreholes, the result indicates that the geological boundary between the late Cretaceous Mingshui formation and the Paleogene Yi’an formation is at the depth of 115 m. The magnetotelluric sounding anomaly areas are corresponding with the unconformities, which are equivalent to seismic horizon T03, T1, T2, and T3, respectively. In addition, the typical “steer’s-head” geometry in the magnetotellurics indicates that the SLB has experienced five evolution stages.
Highlights
As the last period of Mesozoic, the Cretaceous (145– 66 Ma) has been established as a representative international stratigraphic scale based on the well development of marine strata in the world and formed a two series, twelve stages partition succession [1,2,3,4,5]
We present the results of latest drilling Songliao Basin (SLB) Geotherm No 1 (SR1), with the aim to carry out stratigraphic correlation with the SK-1 and SK-2
This trend can be found in the Quantou Formations: the maker layer mudstone was found at the depth interval of 1,473–1,553 m in SK2e, while that was at the depth interval of 2,090–2,537 m in SR1
Summary
As the last period of Mesozoic, the Cretaceous (145– 66 Ma) has been established as a representative international stratigraphic scale based on the well development of marine strata in the world and formed a two series, twelve stages partition succession [1,2,3,4,5]. Stratigraphic correlation is a significant tool to investigate the regularity of the distribution and the characteristics of sedimentary strata in vertical and horizontal directions and can better understand the basin’s paleogeography, paleoclimate, and paleoecology evolution [8]. It plays a critical role in deciphering the earth system dynamics and in solving current socioeconomic problems faced by humans. Driven by International Geological comparison program and Songliao Basin Scientific Drilling (SK), great progresses have been made in Cretaceous strata in China [9] This scientific drilling includes two stages, the SK-1 and SK-2. The SK-1 includes drilling and coring of early Paleogene to Late Cretaceous strata in two boreholes (north and south holes), which can be correlated through a regional marker bed of black shale, while the SK-2, including drilling through the whole Cretaceous strata and coring of Early Cretaceous strata and early Mesozoic to Paleozoic basement of the Songliao Basin, consists of
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