1 State Key Laboratory of Petroleum Resources and Prospecting，China University of Petroleum（Beijing）， Beijing 102249
2 Geological Research Institute of No4 Production Plant， PetroChina Huabei Oilfield Company， Langfang 065000， Hebei
3 Erlian Geological Research Institute， PetroChina Huabei Oilfield Company， Xilinhot 026017， Inner Mongolia
4 Erlian Engineering Research Institute， PetroChina Huabei Oilfield Company， Xilinhot 026017， Inner Mongolia
5 Research Institute of Exploration and Development， PetroChina Dagang Oilfield Company， Tianjin 300280
The Saihantala Sag is one of the main hydrocarbon enrichment sags in Erlian Basin， with an area of 2300 km2 and proved geological reserves of 14580 000 tons. According to the basic theories of sequence stratigraphy， 5 sequence stratigraphic boundaries were recognized by seismic profile and drilling data， and as a result，the Lower Cretaceous of Saihantala Sag was classified into 4 thirdorder sequences. The systems tracts were subdivided with first flooding surfaces and maximum flooding surfaces within each stratigraphic sequence and thus the sequence stratigraphic framework was established for the Lower Cretaceous of Saihantala Sag. Reservoirforming factors in different sequences， such as hydrocarbon source and reservoir condition，and so on，were comprehensively analyzed by studies of depositional systems and their evolution， and 3 sets of sourcereservoircap rock assemblages were established in the Lower Cretaceous of Saihantala Sag. The sandbodies of sublacustrine fan and turbidite fan of the LowerMiddle Aershan Formation and middle part of Member 1 of the Tenggeer Formation， which were connected with source rocks in vertical direction，are able to form effective lithologic traps around the oil generating center of Saihantala Sag. Thus they are the most favourable hydrocarbon accumulation zones and the main exploration targets of the Saihantala Sag.
About author: Yin Zhijun， born in 1971， is an associate research fellowHe majors in researches of petroleum geology. Tel：86-10-86970269.
Cite this article:
. equence stratigraphy and beneficial hydrocarbon accumulation conditions of the Lower Cretaceous in Saihantala Sag，Erlian Basin，Inner Mongolia[J]. JOURNAL OF PALAEOGEOGRAPHY, 2009, 11(3): 330-337.
. equence stratigraphy and beneficial hydrocarbon accumulation conditions of the Lower Cretaceous in Saihantala Sag，Erlian Basin，Inner Mongolia[J]. JOPC, 2009, 11(3): 330-337.
